Ok I had a question about steam that I have not been able to find elsewhere. So as most of you know Civ 5 is coming out for OS X this sometime. I run both Windows 7 and OS X on my Mac and obviously use Windows 7 for playing Civ. However, it is a bit of a hassle rebooting the computer whenever I play Civ. When civ 5 for OS X comes out will I have to buy the mac version or can I just use my steam account and download the game on OSX?