Metol

10/10

ikr

here is the part list http://pcpartpicker.com/p/zt6qK8 but that wouldnt run really good at 4K soo u have 2 options now : build a more expensive build or give up on 4K

well if u want to run games smoothly ( @60fps ) at 4K then u would need more GPU power like gtx 980 ti in SLI would be extremely nice .. if u can afford it ..i will pick the parts for ya

i looked up dell forums and someone who owned the laptop said that specific sleeve is amazing and fits well soo yea .. it got a 5 stars on amazon and the others dont have that high rating soo you should go with this one

Excellent and affordable http://www.amazon.com/Cooler-Master-Hyper-212-RR-212E-20PK-R2/dp/B005O65JXI.

This one should be excellent http://www.amazon.com/Dell-YKHV0-Sleeve-Ultrabooks-Notebooks/dp/B00IPNHDB8

Why not just get windows ?

I made this http://pcpartpicker.com/p/VhMBXL .. it's cheaper and should get the job done but it's an AMD Build

I would recommend z170 chipset because x99 is better for Desktop intense Tasks ( 3D Rendering , Intense Editing and Cinema 4D , etc.. ) but if you want a x99 then i recommend this one http://www.newegg.com/Product/Product.aspx?Item=N82E16813130878 even tho its slightly higher than 400 euros

if u can afford it http://www.amazon.com/Acer-XB270HU-bprz-27-inch-Widescreen/dp/B00UPVXDA8 .. i know the price is quite high but for what you are getting its pretty good ... if u want a TN panel which is cheaper then i recommend this one http://www.amazon.com/BenQ-RL2455HM-24-Inch-Console-Monitor/dp/B007HSKSMI/ref=sr_1_1?s=pc&ie=UTF8&qid=1458211016&sr=1-1&keywords=gaming+monitor .. for the stand http://www.amazon.com/Ergotech-Triple-Stand-Telescopic-100-D16-B03-TW/dp/B007BD0MPM/ref=sr_1_15?s=pc&ie=UTF8&qid=1458211193&sr=1-15&keywords=triple+monitor+stand

500$-600$ per monitor or overall ?

4K Monitor + a 1080p monitor ? well then your double 980 TI in SLI should get the job done .. but tell me what monitors u will choose if you can also if u can afford it .. try to buy a monitor that supports G-Sync Technology .. it will be a REALLY GREAT experience because of the Frame Sync that G-Sync provides .. way better than ur typical "V-Sync" ... i would recommend buying this monitor instead of 2 monitors if u can afford it http://www.newegg.com/Product/Product.aspx?Item=N82E16824009869

Depends on your monitor because higher resolution would need more GPU power as well as the monitor response time and does it support G-Sync technology or not ?

well u can just invest a little more and get MSI Z97-GAMING 5 ATX LGA1150 Motherboard .. its really good i totally recommend it