Since the 510s have been mentioned, I will add this: I like my 510s, and wore them on a coast to coast ride, but they sometimes make a popping noise that annoys me. I think it is the soles flexing — mostly the right shoe, but sometimes the left.

After many years on MKS Touring pedals, I switched to MKS Beartraps and like them a lot. What I really like about MKS pedals is easy bearing maintenance.