I have the coffee shop covers. They stay in my jersey pocket and get put on if I want to walk into a store or if I'm in my in-law's house where they have wood floors. I wouldn't spend money on the walkable cleat system because it means buying extra cleats that are designed for an aero advantage you don't need. And they still come with covers to fill in the holes, so you're still putting covers in a jersey pocket.

In short: Buy whatever speedplay pedals you want, they will come with cleats, and then just by the coffee shop covers.