Larry and Gary have very good points..

As for styles , you won't be limited..The Casio has it's own style converter that absolutely works on Roland and Technics styles..I have my favorite Roland G70 styles loaded in my MZ.

On hands support...you will be limited..I think there are three of us at SZ that actually own or owned one[MZ]...and all three of us like the MZ2000.

As always..sounds are personal...I think the MZ competes with the Tyros ...with a lot of the sounds...and the PSR3000 organ[drawbars], doesn't match the MZ2000..

The safe bet[make most people happy], buy the PSR3000...then the PSR3100 next year...and the PSR4000 the following year..