It's looking pretty unanimous - Win 7 please
+1 on win7
P.S.
If you are a stundent: A lot of universities and schools offer an MSDNAA account. I just got 2 Win7 Pro Licenses (1x32 and 1x64 bit [I thought there would be only 1 license valid for both so I will try installing two 64bit Versions] over my MSDNAA acoount.
To be honest. I am positively surprised about the positive "W7 only" feedback we recive here.
I was expecting a lot of bashing and moaning.
Sometimes it is nice to be wrong.