That's cool! Glad to hear that your DK did so well on the charts.

Naxx is fun solo. I have yet to box it. I guess I am lucky and know enough people to get pulled in every now and then for tanking/healing/dps. I have yet to get invited into Ulduar, but I am generally only on for an hour a day now for Argent Tourney dailies ("of the Exodar" on all five!). I expect those invites will come at some point when the newness wears off. I would imagine you could pick up some tanking gear if you run it a few more times as an off spec set. My priest did 10 man so many times he's pretty purp'd out but never got much tier set(me loves RNG).

I would suggest you try tanking and healing in there just to see all the aspects of each fight. Some of the tanking can be tricky, as can some of the healing.

BTW Love the stacking AT quests once you get Champion with your main faction. Shooting for "of the Faction" for all five factions, but I have to figure out how to make titles auto rotate