help with system for mom

Hey all!  After playing with my new DS laptop, my mom has decided that it is time to replace her old Compaq.  She asked me to pick out a DS desktop that would work well for her needs.  She doesn't play a lot of graphics heavy games so this isn't going to be a super high end build.  I do want to future proof the system a bit.  I don't mind eventually upgrading graphics cards, hard drives, etc. but motherboards and processors are a bit out of my league. 

Here is what I have so far. I'm trying to keep the budget around $2000, but there is some wiggle room.  What do you think? 

Case: DS Twister Pro
Power Supply: 750W Thermaltake (SLi compatible) Silent toughpower Ed.
Processor: Intel Core 2 Quad Q6600 (2.4Ghz)
Motherboard: nVidia 680i LT Core 2 Quad (By eVGA) (nForce 680i SLI)
Memory: 2GB DDR2 at 667MHz
Floppy Media: No Thanks
Hard Drive 1: 320 GB (Western Digital / Seagate) (16MB Cache)  (7200RPM)
Hard Drive 2: No Thanks
Raid Options: No Thanks
Optical Drive: DVD R/ CD-R/ RW (Light Scribe Edition)
Optical Drive 2: No Thanks
Connectivity: High Speed Network Port
Video: 2x SLI Dual (nVidia GeForce 8600GTS 512MB
TV Tuner: No Thanks
Sound Card: Mother Board Multi-channel High Definition Audio
Physics Card: No Thanks
Cooling: Air Cooled Stage 2
Case Lighting: Blizzard Lightning Cold Cathode (Blue) <- Mom loves this
Cabling: Enhanced Airflow (Blue edition)
Windows OS: Vista Home Premium

Thanks!  I will definitely switch the graphics and power supply.  My mom tends to really multi-task and keep the same computer forever, which is why I was thinking of going with the quad core.  I've seen her playing a game, with a video loading in the background, a virus scan going, and checking her e-mail.  Would a quad with a 620W power supply be overkill (switched to the 8800GTS)?

Sounds to me like your spending a lot more money then you need to. I would go with a 500W powersorce and one 8600GTS.