What did you end up doing?
I bought 8 gigs of additional ram, DDR2-800 for $100. And boy its flying now... I can pretty much do anything and its not slow at all. From 2 gigs to 10 gigs was a huge difference. Windows says the bottleneck I currently have is the hard drive's performance. But its so fast it looks like I won't need any more upgrades for another year.