我应该在哪个操作系统上试用vs2010 beta1？哪个模拟器更快？

I just downloaded the VS 2010 Beta1 Pro and I want to setup a vm to try the new devenv. Which os and which emulator software should I try for the best performaces? (currently I've XP sp3, Win 7 RC, Win 2008).I just downloaded the VS 2010 Beta1 Pro and I w