One more thing: Forget this "first pair" stuff.

You're going to have to choose between a cleat system with 2 and 3 holes to begin with, and get shoes that match. If you go Crank Brothers and decide you want Look in the future, you'll need new pedals, new cleats, and new shoes. That's all doable, but for most people (if it ain't broke, don't fix it) there isn't much reason to spend all that money twice. One system vs the other won't make you faster.