I'm going to try going clipless and see what the rage is all about and wanted suggestions on a shoe. I am leaning towards MTB shoes I believe that narrows my choice down to Shimano's SPD 2-bolt design.
SPD definitely. Just make sure you suss out the cleat design, there is an extra easy release model, sort of for beginners, I don't remember it's code but I wouldn't recommend those. I had a set, far too easy to unclip when you're really getting stuck into things.