[Organizers] Keyboards

Princeton Country Dancers has happily used a Roland keyboard for our contra and English dances for many years, but it's finally wearing out and needs to be replaced. We are considering replacing it with one of the following: Kawai ES100 Yamaha P-255 Roland RD-300NX Kurzweil SPS4-8 Does your dance group use any of these (or different models by the same manufacturer) and, if so, what do your pianists think of the sound and feel? Also, how durable have the keyboards been, ie how often have they needed to be repaired? Thanks for your help. Larry Koplik