I always wanted to to a build your own windows vista pc, but this weird thought came to my head. If macs are so "superior" compared to windows in terms of stability and viruses (which i think is untrue), then why not build your own mac? Only one problem... can you buy pc parts, and install osX leapord instead of windows? If not, can you tell me WHY you can not, and how can i find a way to build my own mac pc. Thank you.

The Mac OS X EULA is pretty clear about this subject:

2. Permitted License Uses and Restrictions.
A. This License allows you to install, use and run one (1) copy of the Apple Software on a single Apple-labeled computer at a time. You agree not to install, use or run the Apple Software on any non-Apple-labeled computer, or to enable others to do so.

I wouldn't recommend discussion on this subject.