Am getting one of three synths, any help?

The keys I am looking at is an Ensoniq K-88, Alesis TS12, and/or the Kurtzweil PC1, all these machines are 88 keys, aftertouch, midi, etc, with built in's too. They are all around 8 bills. Any opinions which one is best?
Right now I am leaning towards the Kurtzweil but I would like someone's opinion who may have used one of these boxes. Thanks. The PC1 is cheapest at 700 bucks.