advice on gaming/multi use pc

Hi everyone,

After alot of thought and 'googling', I have settled on ds for my new pc.  I would like some advice on this setup, anything is welcome.  I have not yet included mouse and keyboard, and the monitor is separate from this budget (the second monitor for now will be my current 22 inch one).

Budget- 2000-2800

Usage- I will use this pc for gaming, though I don't need the absolute highest settings, and all of the general purpose home pc stuff, family pictures/videos, documents, music, etc.

Other- I live in an older house where dust is an above average concern.

Monitors- I will use a 2 monitor setup, though only gaming on one, most likely 2 24-inch.

In general, I want a fairly robust pc for gaming and general use that is fairly upgradeable.  Right now I want to stick with a single gpu setup, while leaving the possibility of sli in the future.

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 Maximus IV Extreme-Z (Intel Z68 Chipset) (Features Intel Quick Sync Technology) <b></b>
System Memory: 8GB DDR3 1600MHz Digital Storm Certified Performance Series (Highly Recommended) (Hand Tested)
Power Supply: 850W Corsair TX850 V2 (Dual SLI Compatible) <b></b>
Expansion Bay: - No Thanks
Hard Drive Set 1: Operating System: 1x (1TB Western Digital Caviar (7200 RPM) (Model: Black Edition) <b></b>
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: Wireless PCI 802.11n Up to 300Mbps (Supports 802.11n/g/b) (Model: 3FMPCIMWN-R) <b></b>
Video Card: 1x NVIDIA GeForce GTX 570 2.5GB (Includes PhysX) (EVGA 025-P3-1579-BR) <b></b>
Add-on Card: - No Thanks
Sound Card: Integrated Motherboard Audio
Extreme Cooling: H20: Stage 2: Corsair H100 Liquid CPU Cooler (240mm Radiator) (Extreme-Performance Edition) <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: Stage 1: Overclock CPU 4.0GHz to 4.4GHz <b></b>
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 Warranty

Ram - I think I will be upgrading to 16gb
Gpu - Would it be worth it to go with either the 1.5gb or 3gb version of the gtx 580?
Cooling - Is there any downside to this, being the same price as the noctua air option?
SSD? - Would it be worth it to go with the 250gb ssd?

Thanks for any advice!

Thanks for the input!

I assumed the z68 chipset motherboard would be better for future upgradeability, is this the case?
For the gpu, I was hoping the 570 would be good for awhile, and by then I could look at the 600 series, though I may upgrade the psu to keep sli an option.
I'm still considering the cooling/oc options...

I forgot to answer about the mobo...I wasn't comparing the p67 to z68 platform just wondering if the Maximus Extreme for another $150 was needed.  You would have to compare features and see if it's worth it for you.. Most would say no, but your call.