why sell the mac? im happy with the hardware specs. It wouldn't be worth it to sell at its depreciated value.
We had a thread on this pretty recently. Another member wanted to install only Windows but keep the hardware.
Now, I'm sure you would much rather prefer an answer to your question rather than having people telling you to sell (no offense to the other members, as I stated in the other thread, I am not a big fan of dropping OS X in favor of Windows).
It's quite easy to install just Windows on a Mac. All you have to do is pop in your Windows install disc, and then run the setup as usual.
Before you do this, I suggest running Boot Camp and creating the driver CD. This way you won't have any issues with hardware once you finish installing Windows.