I was initially interested in the KN6000 since a couple years ago I near purchased a KN5000 which at the time looked pretty good. I found a good deal from Ronn Keppler at Keppler (or is it Koeppler Music) in New York State. It was about a half of what a local dealer was asking for a 5000. Try him.

As far as EM2000 - I own a G1000, which is very similar (without speakers and D-beam, but with a nicer, 76-key keyboard), and I would not recommend it. It is good if you have a fixed repertoire and want to program all the settings into the performance memories. If you are like me and want to pick styles and sounds on the spot, it is pretty confusing and very non-user-friendly.