I have a Supcase from Amazon that should be arriving this week for the N10. I'll post some impressions when i get it.
Having tried some cases for the N7 and KFire, it seems that some different brands are really the same thing; the only difference is what name is embossed on it. I'm not a fan of the cases that use plastic clips like the blason, but that's a personal preference.
I'm very interested in what Treegloo comes up with for the N10; they are expensive and getting my case for the N7 was a near nightmare (way slow; thought they might even be a scam) but their N7 case turned out to be awesome.
(Edit: Amazon link for the Supcase above says "Currently unavailable." Grrr. It was $17.98 US (plus more for shipping?? - don't rember.) I suppose that it's not surprising that there is high demand for N10 cases; all the vendors will catch up eventually.)