I've found that using one of the Incipio Feather type cases (SmartC compatible) along with a smart cover is very nice.
That's what i use. The Incipio is very nice as it makes the Smartcover more stable. However it's overpriced and leaves some exposed back (I don't know why they do that). But it's great as it's very light also, and fits well.
I have another one of those type back cases that's also good. There are a number of them.
Note: I also have a Vaja Libreto, but i like this above case arrangement much better. The Smartcover is a very good (half) a case