Do you travel a lot? That's my only reservation against my lovely Mac: it's heavy to lug around.

Work provide me with a 12" Compaq with Windows which is very light and perfectly usable, whilst at home I've become a Mac convert with laptop, wireless keyboard and mouse, cinema display, TV, phone, iPod... they really are that good.

For overnight personal trips I've landed on the a Dell Hackbook (but then I am geek enough to almost enjoy getting that to work).