Intel Core
i7-3930K Sandy Bridge-E 3.2GHz (3.8GHz Turbo) LGA 2011 130W Six-Core Desktop Processor BX80619i73930K - - - - $600
ASUS P9X79 WS LGA 2011 Intel X79 SATA 6Gb/s USB 3.0 SSI CEB Intel Motherboard with USB BIOS - - - - - - - - - - - - - - - - - - - -$400
G.SKILL Ripjaws X Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9Q-16GBXL - - - - - - - $90 X 2=32GB's - - $180
Corsair Obsidian Series 800D CC800DW Black Aluminum / Steel ATX Full Tower Computer Case - - - - -- $255 After MIR
Thermaltake Toughpower Grand TPG-1200M 1200W ATX 12V v2.3 & SSI EPS 12V v2.92 SLI Certified CrossFire Certified 80 PLUS GOLD Certified Active PFC Power Supply - - - - - $280
OCZ RevoDrive 3 X2 series RVD3X2-FHPX4-240G PCI-E 240GB PCI-Express 2.0 x4 MLC Internal Solid State Drive (SSD) - - - - - - $655 X 2 for 480GB's - - - - $1310
Seagate Barracuda STBD2000101 2TB 7200 RPM SATA 3.5" Internal Hard Drive -Bare Drive for storage at $160 X 2 got $320
ATI 100-505604
FirePro V7800 2GB 256-bit GDDR5 PCI Express 2.0 x16 CrossFire Supported Workstation Video Card for - - - - - $620 - - - 1 or 2???
As you probably know there is a BIG difference between workstation video cards for rendering, autocad and 3D rendering and Awesome gaming cards. While the price for each type of card follows the rules of better cards higher prices it is not recommended to try using a workstation video for gaming and viceaversa. You might get away with some lower end gaming with these cards but you won't be playing BF3 with much clarity. It will work - just not well. So if you also want a gaming card to switch into gaming mode then the GTX 680 will be a nice card - newegg doesn't have any instock right now but for about $500 from what I see. I don't know if you will be needing any cd/dvd/bluray drives but they are a dime a dozen so I didn't add any here.
I find the total is a little out of the budget pocket we were shooting for but I wasn't sure what deep pockets meant until I know how much of a rendering system you would require. The TOTAL as built comes to $3965 But that is for only the 1 firepro card and you might want 2 of them. Nor does it include the GTX you mentioned because I don't know if I hit the hole in the pocket or we just need to get into the other pocket.
If you wanted to save some money we could probably drop 1 of the TB HDD and 1 of the pcie SSD's but I think you would benefit from the 2 ssd. Did you see the TRANSFER SPEED on those things??? You'll be getting some work done there I'll tell you. Anyway, if you drop 1 TB drive And 1 SSD we can subtract $815 so that puts you back into the $3,000ish range at $3150. WOW what a difference 2 little parts make huh? As for the video cards - If the asus bios are anything like the gigabyte bios you get an option to boot from pcie1 or 2 or 3 or 4 pcie under video so you could put the firepro in slot 1 and the GTX in slot 2 and boot from whichever you wanted to do - work or play. For that matter you could boot into the game card, start the project, and while it's working in the background you can be gaming in the foreground.
There is always the option of getting the socket 2011 xeon chips and having multiple CPU's operating together and that would speed things up but I needed a place to start so I started here. Let me know if I'm even in the ballpark and we can go from there or we can laugh it off start with something older or cheaper.