Dual Operating System Setup

Hi just about to build my new pc and I'd like install both XP64 and XP

Not sure how to go about it, which one do I put on first and how easy is it to do, are there any pitfalls I should be aware off.

I've got a Raptor as my booting hd and games and big Maxtor 300Gig for other storage, how should I do this ?

thks in advance

I have both in a similar setup. Currently I can't get SATA or Raid drivers for XP64 so I boot to the IDE channel for that & the SATA for stdXP. Firstly try & root out some XP64 compatible SATA drivers & start fom there.