If you can spend around a $1000, I would buy a used Roland G1000[76 good feel ], If you need a Mic input and Harmonizer on board, look for a used Roland E-600[$700]..

If you want a new keyboard and don't need a mic imput, check out the Roland EXR 3/5 selling under $700..

If you don't mind the light keys, a used Yamaha PSR2100 has a lot of features for around $900..likewise PSR2000 for around $700..