Well get them fast. It takes a few months for these early mock ups to finally be available, so you have time.
I've been buying up junker bodies, or quality ones sans their heads.
"New" mib style stuff is out of my price range, but the bodies are really cheap, and work great with third party products. Just like "Kre-O" doesn't infringe on Lego (because the patent has expired) I don't see third party heads like the Cobra as morally dubious. The ones molded to look like G1 characters might be though.
I can't remember the characters, so to me a Mindwipe works just as well with a cobra head master as it would with his original.