we are actually testing windows based hosting now, and about ready to wrap it up. www.dotnetpanel.com is the one we are trying out and so far it is absolutely beautiful. I'll be 100% honest, I have never been a huge fan of linux to begin with and after getting this system up and running and testing it out I have no idea why I started with linux in the first place. Everything runs so smooth and there is no compromise and/or screwing around with anything.
I run windows 2003 on my game server machines and I all of them have been running for 1-2 years without a hitch, blip or anything negative. On the contrary with the linux machines they just like to flake off for no reason.