You might find a used PA80 if you search enough, for just a little more than a new PA60. The PA80 has a vocal board option ( it isn't built in ). The harmonizer sounds very good in it, but doesn't have the presets and some of the options that the PSR2100's has, so you have to set it to where you like.

I liked the 2000 I have a lot, especially the harmonizer and the multipads, but after months of playing with it, I still can't adjust to the key feel the way I'd like to, so it is going going....