I agree Hpasp. The B-2a is truely an amasing machine, but just to put things in perspective: Three B-2´s would probably cost around the same as the 100+ armada you mention, all though their survivability is much better.
As I has a privilege to create any scenario, I can share my personal opinion, than NOT ANY SINGLE DIGIT SOVIET SAM system has
any chance against the B-2A.