You can get 2 or 3 boards for the price of the striker extreme. I would get a backup board instead if you plan on keeping your system for more than 3 years (typical asus warranty). That way, you can replace your dead board and not have to reinstall windows. Boards are typically available for 2-3 years, then you have to look for one on ebay used.
5) Hard drive: SAMSUNG SpinPoint T Series HD501LJ 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive - OEM think a retail version would be better, longer support i got 3 years with mine and got it replaced free of charge when i ran it into the ground. but check it out
2. Striker is a waste of cash (especially if you are getting an ATi card as this board is SLI not Xfire) If you want to stick with the ATi card i recommend a Asus P5K (depending on your needs P5K-e is well featured) If you want SLI get an NVIDIA card ie 8800gts or GTX that way you can use the SLI feature but look at P5N32-E SLI rather than the striker its cheaper and does the same job.
3. As above if you stick with the 2900XT get P35 chipset. If you want SLI get 8800series
If you could afford to wait, wait for Penryn/Wolfdale (whichever is the desktop core).
Get a widescreen monitor.
What OS are you running?
Just about how fast or how much performance are we getting out of the Penryn/Wolfdale compared to the core 2 duos and core 2 quads. I've been kinda out of the loop for awhile. I know its suppose to be more efficient energy wise.
Here is a quality build for $650, before MIRs and without an OS, monitor, keyboard and mouse. Most people already have them but if not you can get everything including a 20" Samsung widescreen for under $1000 + shipping before MIRs.
Most of the parts are from ClubIT or NewEgg or MWave or ZipZoomFly.
Intel Pentium Dual Core E2160 - $77.99 - easy OC (It is so easy to OC to 3.0GHz which is really speedy eliminating the need to purchase a more expensive CPU) Save your $$ for an upgrade to the viideo card. http://clubit.com/product_detail.cfm?itemno=A1938427 ClubIT