I have a new 20" Core2 Duo iMac with 2GB RAM. I'd much prefer running the Mac version of Civ4, but not if performance is markedly inferior to the Windows version. I don't like the thought of rebooting every time I want to play, and I'd prefer not having to run Parallels through a Boot Camp partition (leads to disabled features). Is it a mistake to get the Mac version? I don't plan on using mods, etc.-- just want to play the basic game. But, I want smooth gameplay at high graphics levels. It is a new computer, after all. Thanks!