Devil0359

I'd get a R9 280X instead.

switch up that cpu and gpu combo to a i5 4690k and a gtx 980 an i7 will not really give you performance boost in gaming least not more than th 4690k that is. 

@Skeith @Devil0359 only think I would say is to get the Gigabyte Windforce cooler rather than reference if you want a quieter system, and also to keep the GPU a bit cooler in those Hong Kong summers:
 
http://pcpartpicker.com/part/gigabyte-video-card-gvn980g1gaming4gd

Gtx 770 or the R9 280x are the two best GPUs under 300$.
And upgrade ur ram to 8gb.

Go with a Gtx 970 instead of a Gtx 780.
Beats it in benchmarks.
Costs a lot less.
But not sure if its available right now.
Wait for its availability.

U can have a look at this build to.
 
PCPartPicker part list: http://ca.pcpartpicker.com/p/XKVgZL Price breakdown by merchant: http://ca.pcpartpicker.com/p/XKVgZL/by_merchant/   CPU: Intel Core i5-4440 3.1GHz Quad-Core Processor  ($199.99 @ NCIX)  Motherboard: Gigabyte GA-H87-D3H ATX LGA1150 Motherboard  ($99.99 @ Memory Express)  Memory: Corsair Vengeance Pro 8GB (2 x 4GB) DDR3-1600 Memory  ($100.98 @ Newegg Canada)  Storage: Samsung 840 EVO 120GB 2.5" Solid State Drive  ($84.99 @ Canada Computers)  Storage: Seagate Barracuda 500GB 3.5" 7200RPM Internal Hard Drive  ($58.98 @ Newegg Canada)  Video Card: Sapphire Radeon R9 280X 3GB Dual-X Video Card  ($309.98 @ Newegg Canada)  Case: Corsair SPEC-01 RED ATX Mid Tower Case  ($58.75 @ Vuugo)  Power Supply: Corsair CX 500W 80+ Bronze Certified Semi-Modular ATX Power Supply  ($72.00 @ Amazon Canada)  Total: $985.66
  Prices include shipping, taxes, and discounts when available Generated by PCPartPicker 2014-09-18 15:24 EDT-0400

That is the think with the 750D.  The front panel is restricting your airflow as you can see here,
 

  
Your best options are to add some fans to the top of your case if possible.  Also another option is modding the front panel of your case to be something like the 450D's front panel.  If you mess up, you can always buy a new front panel.  But if you're like me,  I don't feel comfortable doing so so maybe adding top fans to your case is a better idea.  

Thats why I also asked why Z97 board if he is not OCing. (But I was blind when I was checking it so nevermind ).

Bam, even better option.
 
PCPartPicker part list / Price breakdown by merchant
CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor  ($110.99 @ NCIX US)
Motherboard: ASRock H97M PRO4 Micro ATX LGA1150 Motherboard  ($84.98 @ Newegg)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory  ($72.00 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive  ($53.99 @ Amazon)
Video Card: Sapphire Radeon R9 270 2GB Dual-X Video Card  ($159.99 @ Newegg)
Case: Corsair SPEC-02 ATX Mid Tower Case  ($59.99 @ Amazon)
Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply  ($39.99 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer  ($19.98 @ OutletPC)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit)  ($86.99 @ NCIX US)
Monitor: Acer G227HQLbi 60Hz 21.5" Monitor  ($109.99 @ Newegg)
Total: $798.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-14 13:10 EDT-0400

No bottleneck.
Nice build.
Check out the gtx 650 ti boost.
Performs a bit better than the gtx 750ti.
Both the card will be able to play all the latest games on 1080p at medium-high setting at decent frame rate.

Here u go.

    CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor  ($339.94 @ SuperBiiz)  CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler  ($28.66 @ Amazon)  Motherboard: Asus MAXIMUS VII HERO ATX LGA1150 Motherboard  ($204.99 @ Amazon)  Memory: Corsair Vengeance Pro 16GB (2 x 8GB) DDR3-2133 Memory  ($174.29 @ Amazon)  Storage: Samsung 840 EVO 250GB 2.5" Solid State Drive  ($129.99 @ Amazon) Boot Drive Storage: Western Digital Caviar Black 2TB 3.5" 7200RPM Internal Hard Drive  ($149.98 @ OutletPC) For storage  Video Card: Gigabyte GeForce GTX 780 3GB WINDFORCE Video Card  ($504.98 @ Newegg)  Case: Corsair 450D ATX Mid Tower Case  ($109.99 @ NCIX US)  Power Supply: Corsair CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply  ($69.99 @ Amazon)      Total: $1684.15   Build link- http://pcpartpicker.com/p/gZD7Mp     This system would be able to play any game with ultra setting at 1080p with a decent fps.
 
 

As said get the 280 if it's cheaper/same price. It's the same chip.
 
But I have a 7950 from MSI (boost edition) and it's fantastic, I have mine running at 1100 mhz / 1575mhz and it maxes out every game I throw at it (BF4 probably most demanding) at 50-60fps. Often hitting higher than that if you drop AA.

If you're willing to give up OSX it might be worthwhile to just upgrade your computer. --Pick up an 8350 (assuming your current mobo can handle it) and upgrade the gpu. 
 
So...assuming you have a good motherboard, then: 
an FX8350 and an R9 290 (550~ Euros).

that makes no sense compared to the 3 or 4 builds above that destroy ops build 

actually the HD7870 is based on the GCN architectural also
 
Mantle will work with both HD7870 and 270

Ok, thank you.

Go with any one of them.
Msi gaming edition
Asus direct cu2 top.(the coolest and best in looks among all)
Gigabyte Windforce 3x
Evga Acx edition.

That is entirely subjective

Thank you for your suggestions but no I'm not impressed by the looks of 500r.

Yup, you need a Z77 board like this one: http://pcpartpicker.com/part/asus-motherboard-p8z77vlk to overclock your 3570K. There are only a handful of mATX Z77 motherboards to choose from and none of them are really great IMO. If your friend didn't think you were going to be OC'ing he should have saved you a few bucks and gotten you a non-K CPU . 
 
In your case assuming you want to start OC'ing now, you could get a Z77 board for your current CPU and go Z97 + broadwell CPU when that comes out.

Grrr, my friend didn't know what he was doing building this thing (my current rig)!   To be fair, he didn't seem to think I would be interested in overclocking, I suppose, haha
 
Now I think I have to buy two new mobos - one for my mATX rig, and one for my current rig

I think the Z77 chipset whould be compatible with your i5.

Nice, I love the 1TB internal SSD.  Also, it seems the ASUS parts have come up quite a bit, too, I will juggle both of those ideas in my head.  ASUS versus the MSI board.
 
I really, really like the two gtx 660 idea.  If I built the mATX rig, I don't know if that would fit, but that would be a great upgrade for my current rig

Replace your motherboard with a MSI Z77A-G45 GAMING.
Take your stock heatsink out for a cooler master hyper 212 evo.
And add another gtx 660 to your rig.
In case of a need for a power supply add a corsair rm 650 watts.
And some extra hdd/ssd is your wish.
It will total cost u max around 500$ - 700$ max according to which one of the parts you take.

Yes.