For the Hulk:
Bulky Gray Hulk/Abomination
Red Leader/Red She-Hulk
T-Bolts sounds like a good bet. Hoping for some new characters though (like everyone said, Winter Soldier, Falcon, Blob, Pyro, Toad, Mockingbird, Tigra)
Hulk might be the way to go, since we haven't had a hulk wave, well... ever.
I'd love to see a Annihilus Human Torch and Non-phasing Future Foundation Sue too. That's a long forgotten box set though...