If you'd like to try Mac OS X, stop by an Apple Store and give a Mac a test drive. You can play with it as long as you'd like.
Aside from Mac OS X Server, there is no consumer-based version of OS X that can be legally licensed to run on a virtual machine. Apple specifically ties the OS to Apple hardware. Any discussion of thwarting these restrictions is forbidden on this forum.
Oh, and please don't cross-post. One thread on this subject is more than enough.