There are plenty of neoprene sleeves for MacBooks out there, and hard plastic cases that snap on to the top and bottom of your machine. Moshi’s upcoming Codex MacBook Case ($70-$80) is something different. Available later this summer for all MacBook Airs and Retina display MacBook Pros, the case offers benefits over other styles, such as the ability to use your MacBook without removing it. It’s also truly distinctive looking, although…