I have a DJX and also once owned the Casio, I also now own a Yamaha PSR 540. If you can afford it I would suggest the 540, It has a XG soundset, and some pretty good "other voices" I happen to be a HUGE fan of DT as well as Magellin and Liquid Tension Experiment. I also do some Prog Metal stuff with by set up. If your on a budget and you want to do this kind of music the 540 would be a great way to go. You won't get the same leads as Jordan Rudess but you can squeeze some serious juice out of the board. Also the DJX can be a good choice but like I said the 540 is best for the All around kind of voices you'll need. Good luck.