Gibson is by far the best candidate we could possibly muster, although most of Cuomo's critics are to his left and as such will probably not be of much help. Gibson would have to hammer hard on corruption, although Bharara's lifting of Damocles sword makes that more difficult than is desirable.
I like Gibson, but New York Republican party is much more conserative now then half century ago (when it routinely ran pro-choice moderates and even liberals like Javits, Halperin, Reid and Kupferman), so Gibson may be "too liberal" for it. Similar to what we see in NY-22 now, where (despite moderate tradition of district) both announced candidates are closer to far right, and even in NY-19, where Faso is somewhat more conserative then Gibson himself.