The Keiko sub is the same as the megatech Bad. Try with the Mako sub, it's cheap and I think that you can move the angle of the thrusters with the controller.

A new seawolf costs 150$ approx, but you can get one from e-bay, I see some seawolf for only 30$ (also you can get an older version, that is the same sub with different colors( mine's called seastar) http://www.rcuniverse.com/forum/nikk...1976177/tm.htm
I know of Seawolf, Sea star, Ocean explorer and Shark Hunter(or something like that)