If Apple had any sense they'd release a MAC OS for PC's. Unless they're afraid of MS lawsuits.........
Competing directly with Microsoft in the OS market has not been a winning strategy; see OS/2, Be, and NeXT.
Apple did this years ago. They licensed Mac OS to the clone market and let third party PC manufacturers sell machines with the OS preinstalled.
It bombed so badly that Apple had to bring Steve Jobs back to save the company.
Needless to say, you will not be installing Mac OS X on a PC (legally) anytime soon. Just buy the iMac and put Windows on it.