I posted this in another thread but I'll post it here since it's on the front page.

I would also like to go ahead and mention that if you download the Windows 10 Preview ISO from Microsoft and install it in Bootcamp via a USB drive, you will receive a free copy of Windows 10 when it's released late July. (just be sure to log in with your Microsoft account in Win 10). So you guys could buy the PC version and get Windows on your mac for free. I would give the partition at least 150-200GBs if you have the space.