I use CrankBrothers eggbeaters on both my bikes (road and mountain) and I love them. Easy in and out.

My SO has recently purchased Speedplay Frogs, based on some recommendations here on TE, because she was having knee pain issues, and needed maximum float. She said they are so easy to clip out of, that she's a little worried about accidentally becoming unclipped! However, she thinks she will like them, once she becomes used to them. We have yet to go on a significant ride to say for sure, so the jury is out.

Good luck on your hunt.