Something to consider if you want a high quality weighted keyboard is to check ebay for used keyboard workstations from korg, yamaha, roland and kurzweil. These offer excellent keyboards, in most cases better than weighted controller keyboards (only the best controllers, most expensive, will have keyboards equivalent to the better workstations), many will also have easily assignable controls and they offer boat loads of on board sounds that will rival a lot of soft synths and are always available without even booting your computer. I have kurz pc3x and would not trade it for anything. The others have comparable offerings and can be found on ebay at a fraction of new cost.
Brian