So, I ventured farther from home and found an S1000 in another GC. Up too high on the wall, no sustain pedal, no respect!
It generally felt quite good - the white keys, anyway. If I ventured too deep on the black keys they did seem to fight me with the short pivot point. I'm not sure I want to adjust my playing that much. Generally, however, it DOES have an impressive action, if not for me. I was also pleasantly surprised with the built-in speakers, they really had some volume and presence. Casio will sell a bunch of these two new models. Assuming people can actually find them in the store.
OT: Some other boards I got to play...
Kawai ES8 - Very nice.The action was great, the piano samples sounded better than they seemed to in the demos, the speakers were powerful. I'd be happy with this instrument.
Yamaha CP8 - Love love loved the action. Not really the kind of board I'm looking for this time, but if the P-515 action is anything like this (did I read that here?) my search might be over. The CP was a lot of fun to play. No manual necessary, in two minutes you know what everything does. The acoustic piano patches seemed underwhelming, I'm not sure why. Most everything in the Sub section was a bit pedestrian.
* Yamaha Arius YDP-184 - I played this longer than anything else. It felt and sounded great. More importantly, the illusion works - I really felt like I was sitting at a piano. One with a groovy rosewood finish, no less. So yeah, I want one of these, too.