get a Tbird, not an XP, an XP takes up too much bandwidth for SDRAM, especially a 1700, get a 1500 at the most.
That's not really true....just go for the fastest chip that's reasonably priced (XP 1700+). Even with an SDRAM board, using a faster chip will give you more performance since Athlon/XP chips don't demand nearly as much bandwidth as a P4.
I'd get a K7S5A or possibly the new K7S6A. It has integrated AC97, integrated LAN, and you can upgrade to DDR once (and if) prices drop a bit 🙂