Your fans are definitely the largest power draw, most likely the same ones I'm running.
I have the 140 amp Powermaster 67294. Seems to keep everything nice and bright, I don't have a radio or sound system, couldn't hear it if I did unless the engine was turned off. Would be nice for those long waits at the ferry terminal. though.
It would be interesting to put an ammeter on and turn things on one at a time just to see what the draw actually is.