Dude, upgrade your system. You can get much better graphics cards for pretty cheap these days, and get some more RAM. It doesn't have anything to do with this game, but get another Harddrive as well! (you can get like 500 gb for $100 nowadays )
I plan on getting a whole new computer all together...
I've seen like really really nice ones for like $600.
2.4ghz dual-core
315mb graphics card (or some !@#$%)
2gb ram
250gb harddrive
etc.
*rolled up newspaper* no. That's nowhere near good for it's price. Go to cyberpowerpc.com and look at the mega specials that're priced around $600. Most of em have a Geforce 8500 GT, one of em ($55 more than 600) even has two in SLI. And every OTHER spec blows all of those away too. Granted, for the price, it's mostly barebones hardware, but since you already have an OS and a monitor you can transfer both those over and you're making a killing. Where the hell did you find those specs for that price? X-x
The 8500GT is super fail, and SLI is only good for true performance enthusiasts. The best route to go is to just build your own computer. There are plenty of tutorials online to help you with what you need to look for, and I am also willing to help with any questions you have.
To put it in perspective, I built a computer that plays Team Fortress 2 on all high details at 1440x900 for $300, not including a new monitor.
EDIT: Specs of my computer:
AMD X2 3600+ Dual-Core 45 nm processor, overclocked to 2.14 ghz on stock cooling (with new thermal paste)
1 GB DDR2 800 RAM (got another gig coming in the mail)
Nvidia 7300GT w/ 256 MB GDDR2, overclocked to 440 mhz core on stock (this will hopefully be a 9600GT by the end of the summer...it's the best mid-range card available)
160 GB and 60 GB IDE Hard Drives
Acer X203W 20" Widescreen Monitor, 1680x1050 resolution
Yep, $300, and it gives me incredible performance for how little I spent. The 60 GB was second-hand, and I bought my external DVD burner from a friend for $20. Also used my old case from a Pentium III system.