A used PSR2000 will probably be cheaper than a new PSR1000. Lots of people are probably selling theirs because of the new TYROS.

But before you buy, I would recommend to go to GUITAR CENTER and hear with your own ear without any prejudice the CASIO WK1800 versus YAMAHA PSR1000/2000. Particularly on the piano sounds and maybe others and also the key feel. I think you will like the CASIO better. YAMAHA key feel is LOUSY !!!