Easiest thing to do is take the best answer from these synthzone guys and then go to Guitar Center and buy them and try them out - return it when you are not satisfied. That is what I did. I actually tried 4 keyboards before settling with PSR2000 and concluded that it was the best board for the money (for $600 used but excellent condition). At the end I did not even bought any keyboard from GC. I would if things worked out but it did not.

One thing is that the arranger probably does not have the best cutting edge sounds or keyfeel in the market IMO. I think that will always be the handicap although it will probably not the case soon in the future. BUT if you wanna make people dance and sing, it is the best out there without a dedicated and excellent skill level 3 piece band. You can do it all with little effort (you need good solid skill/chops and chords though) !