What is the best carrying case for a MacBook Air (13")?

I've looked at Apple's accessory store and I like the Osprey case. There's a handle on the side instead of on the top, which personally I find to be a better design choice since it's sleeker and more compact, and there are pockets for a charger or anything else. I currently have a Targus case, which is just a sleeve and nothing more. Are there any other options to keep in mind? I'm not looking to spend too much, but I'll consider spending more if something is worth it.