Hey,
If you really can spend your whole 1500$, spend it.
So, my suggestion is that you should get a custom built PC.
Why? Because when you buy a built PC, you get it way too overpriced and also, almost all the hardware sucks except for Video Card, HDD, CPU.. Because they're included in the title, so they wanna show how special the PC is.
OK,
If you want your PC already build..
That's a deal for 1650$:
http://www.newegg.com/Product/Product.aspx?Item=N82E16883227417&name=Desktop-PCs
and that's a deal for 1500$:
http://www.newegg.com/Product/Product.aspx?Item=N82E16883229341&name=Desktop-PCs
And if you want the 1500$ to include the monitor, keyboard, mouse, gaming pad, mouse pad and all that gaming stuff.. This will be a good 1200$ Deal so you get to spend 300$ on monitor and other stuff:
http://www.newegg.com/Product/Product.aspx?Item=N82E16883227426R&name=Desktop-PCs (It's an open-box, be aware)
OK, now for the best part.. getting a custom built PC.
Note: If you don't know how to put the hardware in the case.. Give the parts to the closest PC shop.
OK, for the build:
CPU: i7 3770k
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116501&name=Processors-Desktops
Case: HAF 942 X
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119225&name=Computer-Cases
Motherboard: ASRock Z77 OC
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157328&name=Intel-Motherboards
GPU: EVGA GTX 670
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130782&name=Desktop-Graphics-Cards
HDD: WD 1TB Caviar Black
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136533&name=Internal-Hard-Drives
SSD: OCZ Vertex 4 120GB
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227791&name=Internal-SSD
PSU: CM 700W Bronze Certified 80 PLUS
http://www.newegg.com/Product/Product.aspx?Item=N82E16817171037&name=Power-Supplies
RAM:G.Skill 16GB 1600Mhz DDR3
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231489&name=Desktop-Memory
Cooling: Corsair H100
http://www.newegg.com/Product/Product.aspx?Item=N82E16835181017&name=Water-Liquid-Cooling
That's 1620, get that

and you're ready to go, it's the best PC for gaming, unless you wanna get that 680 (Not much of a diff) or SLI.. (690 is a Dual GPU) The CPU I suggested is the best gaming one..
If you wanna get what I listed but think it's expensive,
Get the i5 3570k/i5 2500k to save up to 130$ and almost get same performance in gaming, if you wanna render/do editing, stick with the one I listed.
Get the 660 ti, same amount of CUDA, and clocks.. The 670 is still better
Get any other MOBO that has USB 3.0 SATA III and that new stuff.. remember to have it as a socket LGA 1155 Z77 MOBO
Get non water-cooling, if you don't plan to seriously overclock your CPU/GPU/RAM..
Get a HAF 912 Case, half the price..
For now, that's what I will suggest... For any help, post here/PM me :embar: