Needing sound Advice on new Gaming platform

Budget:
1600-2000
Expectations:
Run Online games like WoW, SWTOR, Diablo 3 on max settings

Usage:
Online Gaming primarily
Special Needs:
I do live in a fairly dusty environment so I wanna take that into consideration

Saved Ticket #:
627571
Specifications:
[Chassis Model: Special Deal Hot Seller - Cooler Master 942 HAF X
Exterior Finish: - Standard Factory Finish
Trim Accents: - Standard Factory Finish
Processor: Intel Core i7 2600K 3.40GHz (Unlocked CPU for Extreme Overclocking) (Quad Core)
Motherboard: ASUS Sabertooth P67 (Intel P67 Chipset) (New & Improved B3 Revision Without SATA 3G Issue) <b></b>
System Memory: 8GB DDR3 1600MHz Corsair Dominator DHX (High-Performance) <b></b>
Power Supply: 800W Corsair GS (Dual SLI Compatible)
Expansion Bay: - No Thanks
Hard Drive Set 1: Operating System: 1x (500GB Western Digital Caviar (7200 RPM) (16MB Cache) (Model: Blue Edition)
Set 1 Raid Options: - No Thanks
Hard Drive Set 2: Multimedia\Data: - No Thanks
Hard Drive Set 3: Backup\Misc.: - No Thanks
Optical Drive 1: DVD-R/RW/CD-R/RW (DVD Writer 24x / CD-Writer 48x)
Optical Drive 2: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Video Card: 1x NVIDIA GeForce GTX 570 2.5GB (Includes PhysX) (EVGA 025-P3-1579-AR) <b></b>
Add-on Card: - No Thanks
Sound Card: Integrated Motherboard Audio
Extreme Cooling: AIR: Stage 2: Noctua NH-D14 Extreme Performance (Does NOT fit on the regular EVGA X58 3X SLI) <b></b>
H20 Tube Color:- Not Applicable, I do not have a FrostChill or Sub-Zero LCS Cooling System Selected
Chassis Airflow: Standard Factory Chassis Fans
Internal Lighting: - No Thanks
Enhancements: - No Thanks
Chassis Mods: - No Thanks
Noise Reduction: - No Thanks
LaserMark: - No Thanks
Boost Processor: FREE: Overclock the processor between 3.3GHz to 3.9GHz
Boost Video Card: - No Thanks, Please do not overclock my video card(s)
Boost Memory: - No Thanks, Please do not overclock my memory
Boost OS: - No Thanks, Please do not tweak the services on the operating system
Windows OS: Microsoft Windows 7 Home Premium (64-Bit Edition)
Recovery Tools: Windows Recovery Toolkit (Bundled with Windows 7 CD)
Virus Protection: - No Thanks
Office: - No Thanks
Game: - No Thanks
Display: - No Thanks
Surge Shield: - No Thanks
Speakers: - No Thanks
Keyboard: - No Thanks
Mouse: - No Thanks
External Storage: - No Thanks
Exclusive T-Shirt: - No Thanks
Priority Build: - No Thanks, Ship Within 5-15 Business Days After Order Is Successfully Processed
Warranty: Life-time Expert Customer Care with 3 Year Limited WarrantyPlease Type Here]


My big thing I need to know about is if I should go with dual video cards SLI or go with the one i have selected..as stated above I really only intend to play Star Wars and WoW in the forseeable future but I would like to be able to play those with Ultra settings .. and I'm thinking maybe having a resolution around 1920-1080 on a single monitor system. I'm not very proficient with the finer points of the technology so I'm open to some good advice from those willing to help me out.

That looks like a pretty darn good system that you shown me there .. I've kinda been under the impression that I need as much video memory as possible but with my fairly limited budget I think that this card will still be very good and there's always the possibility of upgrading. I'm gonna consider that one strongly, I'm looking to purchase a system within about 2 weeks.