Ultimately, I decided this is what I want to do. I wanted to learn more about the Windows ecosystem anyway, so why not learn the missing bits from C# and .NET (which I came to F# without), and then be able to continue working in a language I love with enough know how to help fill in those gaps myself. Besides, having that under my belt can hardly hurt my career; the nice thing about F# is the related skills are also well in demand too, and a lot more pleasant to code in than some other hosted FP languages ...