Ryan have you checked out the Alesis QS series? The 61 key version is only $599.00 and is way ahead of the Yamaha S-03 in sound and features. This may serve your needs. Also look at the Roland XP-30. I still see some sites selling it every so often.

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.