Bill, in this situation, mass loaded vinyl is a waste of money. It's much cheaper to just add another layer of drywall. The place for mass loaded vinyl is where space is at a premium, or where there are irregular shapes to conform to , like in a car interior.
Staggered studs, lots of mass and some absorbent insulation like mineral wool, or even fiberglass will do the trick. And Greenglue between the layers of drywall.
Oh, and be sure to post pics of you modelling your new MLV head gear