I am using a Casio work station now but not the CTK7200. Casio doesn't seem to be keeping up with the features that Korg and Yamaha are putting out, but if you like then it is just perfect. I have fun with mine and will continue to use it as part of a two tier system.
Hi Musicman, I have Casio WK 7500, which is very similar to WK 7600, which is the 6 octaves version of 7200.
Previously I had WK 6500, so I think I know the Casio keyboards
If you need any advise, I'd be happy to help.