I would do as Nate mentioned above. Run a dual boot system off of a windows computer, that way it gives you a choice, and you can still run necessary programs through your windows OS that are otherwise somewhat disruptive using WINE and Linux.

Kubuntu is top of my list for best distribution of Linux, but if you are familiar with macintosh systems, look into dreamLinux It operates very smoothly, and has a very similar feel and look to OS X from Apple.

The best part about linux is when a new version of it is released, you can update it with a few clicks of the mouse...then viola! Brand new OS!

If you'd like to check out the various distributions through Linux, go to www.distrowatch.com

Have fun!
Andrew