Gabe, good advice. I learned long ago to not live on the "bleeding edge" of technology. It's okay for Geek hobbists and it makes for interesting articles in PC magazines, but not wise for real world productivity.
My brand new Dell Precision 470 workstation with dual Xeon processors should scream with 64-bit WinXP Pro, however, it's running great with WinXP SP2 and PS CS2. I'm waiting until at least SP1 before I consider any upgrade.