I remember getting a 3-manual Yamaha organ in the early 80's and thinking it was the absolute ultimate, and I'd never have to buy anything else. That was about 20 keyboards ago.
I changed from 2000 to 2100, mainly because I could still get good value for the 2K and it cost very little to change. There are some definite advantages, but probably not enough to spend over a couple of hundred dollars difference. Tax deduction will take care of that.
DonM