I am going to try my existing
I will try my G-Form Extreme sleeve, the original version released for the iPad 2. (I didn't like the revised version. It did not really compensate for the smart cover and was even harder to get out of the case).
If this sleeve works it'll still be a tight fit, but I honestly don't feel like buying another case.
If it doesn't fit, I'll wait until more folks chime in. There are some nice choices here, but I need something that will work with the smart cover.