Aye, got lucky on Argaloth early on and got one of my T10s there.
The rest two I have just bought with VPs. Quickly comparing our gear, I've put +50 mastery on my boots and the two big mastery pieces that I have are the T10 chest and Dragonbone Warhelm. If you want mastery, definitely go for those, especially the helm. Daybreaker Helm has more avoidance but the Warhelm has more mastery on it. A couple of other pieces are different but these two make up for the bulk of the difference between our mastery gear.
---------- Post added 2011-02-16 at 03:36 PM ----------
Nope, nothing like that, just the T10 chest and helm I mentioned
I still actually have stamina gems, remnants from my early gear setup, which I've been converting to mastery stones as my gear has improved. One or two more pieces and I can safely convert the last ones, without having my HP drop too low.