Do you want the controller specifically for piano sounds, or for other samples as well? I find that a weighted keyboard for anything but emulating keys doesn't work as well for other sample types (from drums to strings, etc. - even for B3) Action is too slow, harder to bang out quick passages, harder to control afterfeel, etc.
I have been pretty pleased with the action on my Yamaha S80, but it sounds like you have already discounted that one so there goes that...

(although some heavy hitter piano playing friends of mine were pretty pleased by it - Good case of YMMV.)
If you want the feel of a real piano, why not buy a real piano?