Speaking from experience, I find Easton Flatboys combined with 5.10s gives unparalleled amounts of foot to bike adhesion. I reckon they're better than spd's for feeling 'connected' to the bike. Obviously you don't get the pulling upwards ability for uphill grinds, but when descending you can twist your foot on the pedal for superior control - the same foot movement with spds would leave you unclipped.
