Praise,
I've been using Macs since 1986 and have never felt hard-done-by. The new machines are blisteringly fast, and with an emulator programe like Soft Windows or Virtual PC you'll be able to run the few programs that don't port for the Mac (and both emulators run at Pentium equivalent).
You'll also have the advantage of running programs that Wintel folk don't have, like the Mac versions of the Digital Tradition and abc programs like BarFly, which knock the socks off anything comparable on the other platform. At the end of the day, both systems have their fanatical adherents, both will do most of what you want and both will drive you mad.
Given a choice, I'd stick with my Macs, though.
And any problems you encounter, just PM me and I'll do what I can or point you in the right direction.