I'd say go with the card if you like it. You have a good system that's just a little shy on CPU speed, but you'll still get noticable increases with the Ti4200 over, say, the Ti200, over, say, the Ti. The steps just aren't as big. It would be really cool if your board and RAM supported 133MHz FSB, because at that bus speed you'd have 866MHz, not bad for gaming in spite of what all the freaks would have you to believe.
<font color=blue>You're posting in a forum with class. It may be third class, but it's still class!</font color=blue>