I went back and looked at my notes from a few months ago when I went to GuitarCenter to test myself. What I had down was that the feel of the S61 was the best, but the quietest keybed was the LX88+. The LX88+, for the money, has incredible features, 88 semi weighted keys and lots of extra pads and features. and its cheap honestly. But the other slightly weird thing about that keyboard is that the black keys are stiffer then the white keys. In comparison the S61 had a perfectly smooth and consistent high quality fatar keybed. It has limited controls, but if you use NI stuff, the integration is fabulous for that. And slightly noisier keybed then the LX88+, but not as loud as some others.
AKAI also has one that was a strong contender. Keybed quite decent in its own way with a lots of cool pads, knobs and sliders and VIP integration which is more open then NI KK. But I felt the keys were non-standard length or something. But that would be my third choice.
All the other keyboards I tried had cheap feeling keybeds or were noisy as F__ to play and I didn't even bother to investigate them further.