If you want something light - don't go with oberon. While they are great and beautiful covers, they are heavy.
I personally prefer not to use a cover around the house. I use a sleeve instead. I prefer not to deal with the extra weight and bulk of a cover around the house. I bought the slip case from waterfield and have nothing but good things to say about it -
http://www.sfbags.com/products/kindle/kindlecase.htm
When I take it out I use a M-Edge platform cover. I feel it provides a decent amount of protection, plus you can stand the DX up in it. Great for reading at restaruants. Plus the cover folds back easily. Here is the link to their store and this cover (amazon.com does sell these, but not all the colors) -
http://www.medgestore.com/products/k...x-platform.psp
I also highly recommed a skin. Decalgirl.com is great.