Gaming computer build help? $2000 USD Out the door.

[kyorean]

Tower only, i'm not too sure how to approach this since I've never spent over 1k on a build.
Also should I do win7 or 8.1 or just wait for 10?
Im planning to buy during Christmas sales if there are any good deals.

For now 2k RETAIL price.

I'm planning to play COD, BattleField, CS, DotA2, PS, AI, CADD programs, 3D rendering for school stuff.

Any help would be useful!
Thank you in advance!

 

[kyorean]

How does this look?
http://pcpartpicker.com/p/KpRnwP

 

[g-unit1111]

How does this look?
http://pcpartpicker.com/p/KpRnwP

Storage is quite a bit overkill there and I'm not sure why two HDs are needed, but here's what I would suggest:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($299.99 @ Newegg)
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler ($69.99 @ Amazon)
Motherboard: Gigabyte GA-Z97X-UD5H ATX LGA1150 Motherboard ($149.99 @ Newegg)
Memory: Corsair Vengeance Pro 16GB (2 x 8GB) DDR3-2400 Memory ($179.99 @ Amazon)
Storage: Samsung 850 Pro Series 256GB 2.5" Solid State Drive ($160.98 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.59 @ Directron)
Video Card: EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card (2-Way SLI) ($344.99 @ SuperBiiz)
Video Card: EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card (2-Way SLI) ($344.99 @ SuperBiiz)
Case: Fractal Design Define R4 Blackout with Window ATX Mid Tower Case ($119.99 @ NCIX US)
Power Supply: EVGA 850W 80+ Gold Certified Fully-Modular ATX Power Supply ($94.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($16.99 @ Directron)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($86.43 @ SuperBiiz)
Total: $1906.91
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-01 14:42 EST-0500

 

[kyorean]

How does this look?
http://pcpartpicker.com/p/KpRnwP

Storage is quite a bit overkill there and I'm not sure why two HDs are needed, but here's what I would suggest:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($299.99 @ Newegg)
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler ($69.99 @ Amazon)
Motherboard: Gigabyte GA-Z97X-UD5H ATX LGA1150 Motherboard ($149.99 @ Newegg)
Memory: Corsair Vengeance Pro 16GB (2 x 8GB) DDR3-2400 Memory ($179.99 @ Amazon)
Storage: Samsung 850 Pro Series 256GB 2.5" Solid State Drive ($160.98 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.59 @ Directron)
Video Card: EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card (2-Way SLI) ($344.99 @ SuperBiiz)
Video Card: EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card (2-Way SLI) ($344.99 @ SuperBiiz)
Case: Fractal Design Define R4 Blackout with Window ATX Mid Tower Case ($119.99 @ NCIX US)
Power Supply: EVGA 850W 80+ Gold Certified Fully-Modular ATX Power Supply ($94.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($16.99 @ Directron)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($86.43 @ SuperBiiz)
Total: $1906.91
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-01 14:42 EST-0500

how do I know how much power i need for my PSU since im doing an SLI?