My FAV 'piano module' is the classic 'RealPiano Expander' by GEM (General Music):
http://www.af.lu.se/~fogwall/piano.html

It includes highly impressive 'string resonance', 'damper pedal' and 'key release' physical modeling features. Though this unit is no longer manufactered, I hear that GEM is planning to release an EVEN MORE advanced version of the 'RealPiano Expander' in the near future. Keep your eyes and ears open for it. NAAM 2002?!