Best pedals for a road bike: 10 clipless pedalling systems for road cyclists - Including options from Shimano, Look, ...

While the M520 lacks the flash of premium options it does basically the same thing for a small weight penalty in a package that'll take years of abuse.

If you find SPD systems too rigid then the Crankbrothers Candy pedals may well be for you, but you'll have to look after them.