I bought this keyboard on kijiji a couple years ago for 1000$:
http://www.long-mcquade.com/products...d/RD-300NX.htm
Weighted keys, a reasonable selection of sounds (strings, piano, organ, guitar, etc.), 88 keys and you play it through an amp rather than the built in speakers. All depends on what exactly you're wanting to use it for. That was pretty much the only reasonably priced keyboard I could find that had weighted keys, a good numbers of sounds and 88 keys that had a 1/4" line out to play through an amp. If you're primarily wanting to use it for piano however, that may not be your best option.