I really liked the Shimano PD-T8000 combo flat/SPD pedals. They spin freely when you unclip to point directly downward so that it's easy to find the clip or the flat side without looking.
They were a little wide for the more aggressive style cycling I was doing, and ended up getting pedal strikes when pedaling hard through sharper corners. I've substituted them out for the ISSI Flip 3 pedals, which are narrower and don't get pedal strikes. However they don't align themselves like the Shimano PD-T8000 did so that's kind of annoying.
The Shimano EH500 look like a good pick too, but I don't think they align themselves either.
The one thing you really want is to have pins on the flat side and not just molded nubs. The pins give waaaaayyyy better grip when riding in flats.