If this is your first time going clipless, I'd suggest EggBeaters (my personal choice) or SPD.
You can get into and out of EggBeaters very easily and they're 4 sided.
SPDs are two sided (usually) and are also easy to clip into and out of.
Ease of clipping in and out in traffic is a major concern to many commuters.
I second the idea of sneaker-like mountain bike shoes. They look better for commuting and you can walk on them like regular shoes.
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.