My suggestion is if you can find a WK (used) or for a really good price give Dan0 a call, I'd buy one of these models. The CTK is nice, but it doesn't offer a pitchbend wheel. Either WK will give you 76 full size keys (which would make a great controller for the PSR-2000), and you'll get the wheel or wheels.

Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.