Nords are sweet, but possibly a more serious investment than you were after, at around $700 and up for used. Killer B3 simulator.
Also 2nd Kurzweil, love for the PC88, SP88, K2000 which can probably be found for about half that amount or less. Natural piano action, and decent sounds.
"There, in huge black letters, was 'The Grateful Dead'. It just... cancelled my mind out."-Garcia