Leopard, use that. It makes Tiger look shameful in comparison. Heck, you probably never knew there was another OSX anyway. Whatever, if you want a PC, use one, but they suck once you've had a taste of OSX Leopard.
Once I get enough money, I'm buying it all. Final Cut Express 4, the full version of GarageBand and all the external mixing **** that comes with that, etc.