I like their pricing for Windows Web Server 2008 -> $469.
Pretty good for startup if you choose ASP.NET.
But there's the possibility that someone would gain productivity by using linux.
Try Windows Server 2008 XLT, now with 20% more server goodness. If you like that, you'll love Server 2008 XLT-VX with all the server goodies you've come to love and 10% more virtualization!
Act now, supplies are limited.