This certainly wouldn't belong in the simple questions thread at any rate. Here's an idea: Go try it out and come back with some information if it turns out to be good.
I tried setting up rawr for a 50/0/21, and i must be doing something wrong, but i was wondering if that spec is as viable as the old 40/21. The sequence that came to my mind was, FrB,FrB(MBproc), AB,AB,AB, AM, back to frostbolt. With the talented time reduction of Cold Snap, you would be able to use it twice on many fights. And is the new cast reduction on empowered FrB equal, better or worse then MW presence?