If your price range is tight I suggest the 3000 over the Yamaha. It will still give you more options. Also remember the Casio will load samples into the board. The free Casio software allows you to convert them to the Casio format and then load them into the board. Very good feature here. You load all kinds of samples from sound effects to drum loops to full instruments. Both the 3000 and 3500 have this ability

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.