Gosh, that's a tough one. It's between #2 and #3, but it depends. With a TV contract, I pick #2, hands down. No TV deal, I have to go with #3.
Don't think only about the easy money. There's also women. The first three get all they can handle. The biologist, on the other hand, probably suffers from charisma deficiency. And I never heard of a biology groupie.