I'm restarting uni next year (took a break) doing a Computing course. And i've gathered a list of the most used programs needed and need to know if its worth getting a mac?

I'll be using at least: Eiffel, Oracle / Oracle Developer, Sybase, JBuilder and Visual Studio.

Can they be run on the Mac? I've heard that there are mac version available but our uni don't provide them. So is a 12" powerbook good enough? or will i be better off sticking with a PC?