I used a Yamaha motif for about 10 years
We use some of the older ensoniq keyboards I can't remember the model numbers. They are quite important for capturing certain 80's sounds.
There are a few things heavier. Godzilla, The Titanic, Mount Rushmore, Whoopie Goldberg,...The thing scaring me is weight. I think i'll really appreciate a lighter keyboard if I can get away with it.