[Natobasso]

You're never stuck; just get a computer you can easily upgrade like a G5 Tower.

I'm also, personally, getting very annoyed with upgrade fever that seems to permeate the apple realm. Though it is getting better since OS X updates are coming out every year and a half now instead of every six months. Wait till all the diehard razor's edge mac fanatics suffer though the bugs and THEN buy Leopard, maybe 6 months later, after the update/fix comes out.

This will sound old fashioned, but why not actually be satisfied for a few years with a machine that you've bought?! Obsolesence happens daily but it's like trying to 'Keep Up With the Joneses'--it's just not worth it. Unless you're chewing through hi res video files or running ten in-line plug-ins in Cakewalk while recording live, you're not going to see a huge speed increase over 12 months.