Actually, I'll say go with the Xbox.
Your computer should provide you with enough juice for word processing, spreadsheet and all the MS office BS (I don't know what else you do but I don't suppose you do 3D modelling on your computer

)
A geforce3 is going to cost as much as 2 xboxes, is that crazy or what? Now that 3dfx has gone under, the outlook for future PC graphics is grimmmmmmmmm, I'd tell ya.
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"There wanst was two cats of Kilkenny
Each cat thought there was one cat too many
So they fought and they fit
And they scratched and they bit
'Til instead of two cats there weren't any."
- "Anonymous"