Or you can get something like this: http://www.ebay.com/itm/Genuine-Dell-ATI-Radeon-X600-SE-128-MB-PCI-E-x16-DVI-Video-Graphics-Card-H9142-/131615678440?hash=item1ea4e7dfe8:g:NGwAAOSwWnFWCuHB
But, honestly I have one, it cost less than 10 bucks and can output 1920x1200
Looks like a standard Micro ATX board: http://www.game-debate.com/motherboard/index.php?mot_id=2971&motherboard=Dell%200RY007
Just make sure the IO shield is standard(removable) and you can probably fit it in most cases.
A6000 will have better 1080p and the G7 has 4k.
4k is harder to work with if you don't transcode, but it can give you a lot of flexibility with cropping, down sampling, and I found it helps clean up noise in higher ISO video.
On the other hand the 1080p will be easier to work with and 4k really isn't that necessary.
And the 4k files sizes are bigger on the G7, but they aren't too bad. (For reference I own a G7)
I have an i3 4170 and a GTX 760 in my little brother's build and so far it's been working great (minus the terrible fan noise and coil whine from the EVGA b-stock 760)
Right now he plays a lot of MGSV.
I think the Silverstone SG10 can fit that cooler. It's a good case, but it can be a pain to work in. http://www.newegg.com/Product/Product.aspx?Item=N82E16811163237
Cheap, widely used, effective, fits in the majority of gaming cases, well known brand, and its been around for quite a while.
There are other very competitive coolers, but because so many people have used the 212 its very easy to recommend.
It will vary game to game. Here's a video of a 750ti rig (only slightly slower than a 660) compared to a PS4.
https://www.youtube.com/watch?v=9OE2iI7OLh8
PC also has the advantage of adjusting the settings, while Rockstar decided to lock the PS4 at 30fps with what looks like Very High settings.
A 660 will only give you about PS4 equivalent performance. A GTX 970 or R9 390 will give you a nice performance boost (I upgraded from a 660 to a 970). SLI is really not worth it in my opinion especially since not all games support it.
Like everyone else said, GPU, PSU, SSD. The GPU and PSU might not be totally necessary, a GTX 960 is still a good GPU. I'd get an SSD if anything, they're pretty cheap nowadays and give a nice improvement to load times.
The i3 should play 1080p no problem, but instead of buying a used 4150 for $110, you could just spend the extra 10 bucks on a NEW i3 4170. http://www.newegg.com/Product/Product.aspx?Item=N82E16819117543
I have one computer that still runs windows 8.1, when I install windows 10 it constantly crashes. I think it's something to do with the GPU, but it's too big of a headache and I don't want to deal with it. (plus the PC doesn't really need W10)
I have a Dell U2414H and whenever I turn it off I can hear this quiet, but audible buzzing. I don't notice it at all during the day, but at night when I'm trying to sleep it can get annoying.
On the other hand when I leave the monitor on and let it go into power saving mode the buzzing disappears, but I'm worried that leaving the monitor on might damage it in the long term.
Is it safe to leave the monitor in power saving mode? Or should I turn off the monitor whenever I'm not using my computer?