Don't even get me started on Vista. It is half as fast as XP doing the same tasks even after installed SP1, and it gives you absolutely nothing over XP. In case you care, I am typing this from Vista Biz edition, and have to work with both XP and Vista every day, and looking at the pig Vista is, I have opted to only install it on my laptop at home. It has DX10, yes, but DX10 is just DX9 that is easier to program for if you want to break it out into reality. Yes, it has more advanced pixel shaders, but show me one person that can see the difference and I will congratulate them for being able to spot it. Pointing out that it has 20% less performance in the same games is not the type of difference that I am asking to have pointed out.
Anyway, the OS you should install, and it is not in your list, is Media Center Edition 2005. If Vista were Win ME (It's nickname is ME II), MCE 2005 would be Windows 98 SE.
Just my two cents.
-S
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