killinsound,

mdorantes is dead on with his suggestions. Yamaha has the P-120, but if you want to go cheaper and still get great sound with 88 fully weighted graded hammer action keys, the P-60 is also a nice choice.

Casio as stated by another member has the Privia series. Take a look at the PX-100. I can't see you being interested in the PX-300 because all you basically want is 88 weighted keys in a light weight package with good piano sound. I think the Yamaha P-60 or Casio Privia PX-100 will suite you. There's also a significant difference in the price between the Yammaha P-60 and Caiso PX-100.

Squeak