I considered the M-Edge Latitude for Nook, but ended up choosing the Alice in Wonderland cover. I like the way it feels in my hands when I'm reading. And it's hard enough to protect the Nook when it's in my bag. However, if you're out and about a lot and want the Nook to be completely enclosed, check out the M-Edge Latitude cover. They have it at Best Buy. It has the four-point mounting system so you can read your Nook in the case. And it zippers all the way around to protect it. It's light, too.
http://www.medgestore.com/products/nook-latitude.psp
Good luck!