DX7s

I need a good sounding piano sound module that I can connect to my DX7s. I have three choices; 1. Yamaha P-50m, 2. Kurzweil Micropiano, 3. Alesis nanopiano. Any suggestions on which is the best one? I hope Roland have those class of piano module.

The Kurzweil Micro Piano is your best bet.
It includes the same piano sounds as in the
k2000 and 2500 and pc 88. It has a full
88 note bandwidth and its the most realistic sounding piano sound on the market.
list price $600.00(remember thats the list
price, it will probably be cheaper through a
music store.).