.NET Languages

Which one do you like? I have narrowed my choice down to Nemerle, Boo and F#. I really like Nemerle, but it's the least active of these, F# looks nice and is supported by Microsoft, Boo kinda failed to excite me, but isn't bad.

DISCUSS!

About Nemerle, anyone know how I can match function? I want to do something like this:

match (x)
{
  | _ is string => WriteLine ("string get!");
  | _ is int -> string => WriteLine ("fun string get!");
  | _ => WriteLine ("dunno lol");
}

But ncc sez "error: unbound type name ->". Ideas?