Sunfactor,
If you're considering buying the PSR-450 I would strongly suggest you look at the Casio WK-3700 for the same price. In my opinion MUCH more bang for the buck. Also you can even get the current WK-3500 for less (new).

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.