Is the XFX9800GT a decent card fo normal usage. I don't play games. Use computer for Web editing, Word and Excel and Web browsing. I currently have a XFX8800GS and it does everything I need very well. I can get the XFX9800GT for $99 after $30 rebate
If you have $100 to spend, then buy another 4Gigs of RAM. It will make VMWare or MS Virtual PC run much better and allow you to virtualize your Web environments.
PS: This assumes you have Vista 64. If you dont, then take your $100 and buy CoD4 and Orange Box and enjoy that 8800GS you have.
/opinion
EDIT: Just saw your sig, and you use Vista 64, so get another 4 Gigs of RAM.