Ive been using Solidworks, Catia, AutoCad, Inventor, and others for about 6 years, and ive been running those on a currently 7 year old dell inspiron 1501 laptop.  My current laptop is so old and slow i can only have one of these programs loaded into it at a time.

I finally am getting together enough cash to build a future proof system that i can use for light gaming and mostly drafting and rendering.

This is the build I was thinking of so far.

1. Evga Classified SR-2 motherboard
2. Xigmatek Elysium Case
3. 2 - 60gb SSD's in RAID0 off the two SATAIII connections for the OS and Solidworks...should read and write at about 1gb/sec
4. 2 - Antec kuhler 620's for the CPU's
5. 2 - G. Skill Ripsaw 24gb DDR3 RAM at 1600MHz
6. LITE-ON blueray, dvd, cd writer and reader
7. Classified SR-2 1200W continous power supply
8. 2 - Intel Xeon E5645 Processors OC to 3.6 GHz
9. 2 - WD 1 terabyte HDD in RAID0 for everything else

My hang up is on the graphics card, ive been trying to read forums and alot of the ansers are 2 or 3 years old and graphics cards have made huge leaps over the past couple of years.  I am also hearing different views that Gaming Graphic cards wont work well with solidworks, but i do not want to spend alot of money on qquatro cards or firepro cards especially since they dont do gaming well at all.  I have 4 cards im trying to choose from and I have a couple of factors to my decision:

1. I plan on starting conservtley and then expanding to 4 cards total eventually since the SR-2 has 4 16X slots not only for better graphics but for the processing power each card will provide.  So either I can get 4 consertive cards if they will run everything really well or i can get 4 high quality cards.  i dont know which one equals out to a couple of workstation cards
2. Price
3. Value
4. I plan on soft-modding these so I can run real-view in Solidworks
5. How well they will run cad programs
6. how well they will run games
7. the fact that i dont want a workstation card
8. future proofing

The 4 cards im trying to choose from are:

1. 2- XFX 6950 2GB GDDR5 in crossfire total of \\\$550
2. EVGA Geforce GTX 580 3072MB GDDR5 \\\$590
3. EVGA Geforce GTX 590 3072MB GDDR5 \\\$730
4. XFX Radeon HD 6990 4GB GDDR5 \\\$730

Any help or advice that could be given on this would be very much appreciated, Im going to be building this systemm in a few weeks and im not sure what card will be best for the future to me choices 1 and 2 are pratically the same and if i had to have my pick between 3 and 4 i would choose the 6990 because i could run solidworks on 5 monitors in eyefinity mode.  thats what i mean by value and future proofing, not a lot of other cards could run 5 displays if i wanted to do that someday or maybe 3 monitors and a 3D projector, I dont know at this point thats why I want help with this choice from the Solidworks community.

Thank you very much

-Joshua Koch