Personal interest. Currently I used Softlayer data center.
Unfortunately I am not sure about DataCenters but as far as Linux/Windows clustering, http://www.cartikahosting.com is supposed to be the best. I would contact their sales team via Live Chat to find out more about their networks.
Getting Linux and Windows VPS directly from LiquidWeb is a good option for you. This will help you in having more control over your account along with getting support directly from LiquidWeb. I am not sure of Windows Host using LiquidWeb but I think Aquarius Storage are using LiquidWeb servers and they have good reputation here.
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