i have pro at home...
EASYiest setup i've ever done on a computer. period.
insert CD, partition HD with that CD, format HD, install XP, (mind you, this is with ALL of my cards and peripherals plugged in and on), it then asked if i had an internet connect/service, clicked yes, entered username and password, and whalla, i was setup on DSL. no crappy ISP stuff to install or configure.
it's a little different in the start menu, but once you get used to it, it's awesome.
a friend of mine who works for dell and does server testing for them, says that xp pro mainly has more networking stuff in it. nto much of a difference at all than the home.
go PRO if ya can afford it. i'm diggin mine so far!