IMO, about the only area the Casio would win out in is the 76 keys and maybe the piano sound. The PSR 2000 would have more and better sounds overall. So it depends on what is more important to you.

I had a PSR 1100 and sold it and got a Casio WK3200 and have been kicking myself for it. I only use the keyboard for recording and the quality and variety of sounds on the Yamaha was much better for my needs. The 76 keys are nice though and the piano sound is a little better IMO especially on the low end.