Maybe I'm just over thinking things. My BK9 is great but in its Gator Pro case its a bit heavy and bulky. Even though its a semi rigid case I think it weighs almost as much as the keyboard but the protection it gives is worth it.
I've got a 61 key controller for the Bk7m ( I also like using the BK7m with my FP90 piano at home so I'd never sell it.) but thats two ac adaptors, midi cable, and a two tier stand.
Mostly something for a cocktail hour or quick senior gig or a short jam. For sound I have a JBL Eon10 which is amazing for its size and weight so I don't care about onboard speakers. Like I said maybe I'm just over thinking things.