Answers
dont try e bay. unless you want some cracked out controaler
i would recomend looking at the Oxygin 8 (aplying your more of a synth type of course) its not the biggest keyboard but the 8 controal knobs and intuitive pitch and mod wheles have kept me happy enough if you wnat cheeper buy a stupid CASIO keyboard you know the kind they sell at radio shack BUT be warned sometimes they conflict with external moduals the most common glitch being youll play a note and it will go on an infinate sustain (or it wont shut up) untill you kill the power.
hope that helps