Speaking as the underdog main tank for one of the "up and coming" guilds...
4456hp, 995ac. Just hit 65 recently (Yay me!)
Just a handful of AAs, and our guild's been looking to do DHK mobs as well.....
The way its being described, I don't think we'll ever touch DHK for quite awhile if the trash mobs are hitting for 600s and so forth.... We really don't have that many MT's to spare for rampage tanking either (heck I'm the only main tank so far), also, a good portion of our dps comes from straight meleers or pet dps.
Dunno about you but Stormseye and Stormkeep are starting to look like better and better raid zones if DHK really is that hard. Dah well, theres always planes and other raid zones to try until then