Old Gamer's Last Computer

Hello,
If you're reading this I'd be grateful for some feedback and thoughts.

I'm a gamer who's getting older (aren't we all) and while life has been great, I have less time to play games.  I'm looking to get my "final gaming computer" that will last for the next 5-6 years (into marriage and beyoooond!) and will hopefully be able to play games in the future, barring any incredible change into 3D gaming. 

The most graphics heavy thing I'll use will be FPS's.  I use one monitor, a 1680x 1050 which will likely remain attached until it dies.

Here's the configuration.  Anything extraneous?  12 gigs of RAM might seem excessive, but I'm thinking down the road with next Windows.  Does the power supply look right or do I need to bump it up?  Please give me your thoughts.

Thank you

Here it is

Chassis Model: Special Deal Hot Seller - Cooler Master HAF 932
Exterior Finish: - Standard Factory Finish
Trim Accents: - Standard Factory Finish
Processor: Intel Core i7 950 3.06GHz (Quad Core)
Motherboard: ASUS Sabertooth X58 (Intel X58 Chipset) (Features USB 3.0 and SATA 6Gb/s)
System Memory: 12GB DDR3 1600MHz Digital Storm Certified (Highly Recommended) (Hand Tested)
Power Supply: 750W Digital Storm Certified (Dual SLI Compatible) (Silent Edition Recommended)
Expansion Bay: - No Thanks
Hard Drive Set 1: Operating System: 1x (1TB Hitachi/Seagate (7200 RPM) (32MB Cache)
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: Blu-Ray Player/DVD Writer (Play Blu-Ray and Burn DVDs)
Optical Drive 2: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Video Card: 1x NVIDIA GeForce GTX 580 1.5GB (Includes PhysX Technology)
Add-on Card: - No Thanks
Sound Card: Integrated Motherboard Audio
Extreme Cooling: AIR: Stage 1: High Performance Cooler (Compatible With i5/i7/AMD Processors)
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
Boost Processor: - No Thanks, Please do not overclock my processor
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 Ultimate (64-Bit Edition)
Recovery Tools: Windows Recovery Toolkit (Bundled with Windows 7 CD)
Virus Protection: - No Thanks
Office: Nero Express CD Writing Suite
Benchmarking: - No Thanks
Install/Test Game: FREE: Hot-selling game with a NVIDIA GeForce GTS 250 or above graphics card
Display: - No Thanks
Surge Shield: - No Thanks
Speakers: - No Thanks
Keyboard: - No Thanks
Mouse: - No Thanks
External Storage: - No Thanks
Exclusive T-Shirt: FREE: Digital Storm T-Shirt - Black (Medium)
Priority Build: - No Thanks, Ship Within 5-15 Business Days After Order Is Successfully Processed
Warranty: FREE PROMO: Life-time Expert Customer Care with 4 Year Limited Warranty

My max budget is likely 2500, but I wouldn't mind going under.

this one looks good for you, you could save a little extra going down to the u12p cpu cooler... no loss in performance