
Of course, if you don't need the speed, you could go for one of the original models - after all, even the original Mac mini's around a 1.5GHz G4, which is no slouch! And they're bound to be going fairly cheaply now, just as the 17" PBG4 (list $2500) can now be found around $1800, thanks to pressure from the MacBook Pro. Indeed, I've seen the 1GHz version going for a bit over $1000.
Really depends what your budget is, of course, and whether you might enjoy the freedom of a PowerBook/iBook. You could be anywhere in (or around!) the house and on the net, with a WiFi connection.. and there's a lot to be said for the computer being where
you are, rather than vice versa. ^_^