The PSR 2000 and 2100 were really great arrangers.
The 2100 brought buttons for choice of intros and endings (2000, you had to pick them from screen ahead of time).
There were also a few other improvements. They fixed an error in the VH that they swore for three years didn't exist.
I may recall that was the first PSR that could be updated by software. Not certain though.
Billy Joel wasn't bad either.