Starkeeper, I know you'd love the PSR-1500. It has everything the 550 doesn't. Mod. Wheel, internal sequencing (both song and style), large screen (like PSR-2000), drawbars, over 90 note poly, nice sounding speakers, and so on. It would be a huge jump for you coming from the PSR-550. I've never looked back on selling mine

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.