ok, so right now with my setup on low i am getting a 2400 benchmark score and i wanna get it higher. I have 200 bucks to spend so just curious on what you think i should upgrade to.

System Specs-

processer- AMD Phenom x3 8450 Tri-Core 2.10 GHz
Ram- 4GB ddr2
OS- Vista SP2 64-bit
Graphics-Nvidia 9800gt 512mb
Chipset- AMD 780G
Power- 600 Watt power supply

Also, i can get Windows 7 Professional (x64) for free cause of where i go to school. Do you think its worth having to reinstall everything to upgrade? is it going to run better?