If you're looking for good support, surely you should look at managed provider because for unmanaged provider usually they takes longer to reply your support tickets..
Agreed not to mention unmanaged services are as it says, unmanaged. The provider will not help with any installs/upgrades or problems unless its directly caused by them or in relation to there control panels etc.
Please provide which location you want..
What Windows Version you need..
and how much dedicated ram, and bandwidth?
You can always search in the search function for "Windows VPS" and you will see alot of posts from the VPS Offers section that are related to Windows VPS hosting, or you can just have a look in the VPS offers section for windows VPS's.