Everybodies favorite clipless seems to be eggbeaters but that doesnt sound like what your looking for.
I think I want the Mallet C's so that I get to have a platform there and also have the eggbeater core since its the most popular clipless system I can think of. You may want to check them out and see if you like how they are. Candies are a smaller version of it that look pretty neat.
This is a the fastest way to see what they look like really fast
Mallet C's -
http://images.google.com/images?q=mallet+c&hl=en
Candies -
http://images.google.com/images?svnu...ggbeater+candy
they come with the cleats to go on your spd shoe so should be compatable.