PC all the way!
Though, in all fairness, I have only played with macs a little bit, so I cannot say I don't like them. But, I have been using PCs for so long now, I think it would waste more time to switch than it would to just stick with what I know.
My system:
Dell (first PC I ever bought whole... that I didn't put together)
Intel Core Duo 2.8Ghz
3GB RAM
120GB / 300GB internal HD + 500GB External
22" Widescreen + 20" Standard monitors
It keeps Photoshop happy and not bogged down...
