My Shimano M520 SPD's came with a flat plastic platform on one side and reflectors on the edges, which i promptly removed so I could clip on both sides of the pedal.
They're pretty unexpensive and easy to unclip at the loosest setting. Replacement cleats are available at most any bike store.
Pair them up with a good mountain bike shoe and you're ready to start going clipless.
I've never tried Eggbeaters, but I see no point in them unless your daily commute involves going through miles of mud.