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Check out the PD-M424:
http://www.chainreactioncycles.com/shimano-m424-clipless-spd-mtb-pedals/rp-prod7808
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The 'Trail' style pedals aren't really intended for use with normal shoes, the clicky bits stick up above the platform so you end up standing on that rather than a pseudo-flat pedal. If you really want to ride a lot in flat shoes, you want something like the PD-M324 or one of the other single sided road/touring SPD pedals like PD-A530.
Shimano PD-M520