Yeah I have close to 300AA now, level 62 but just banking a few more then going for 65 before I stop for more.
I find the useful ones are the ones which you'd think would be useful - stuff like the Eldritch Rune, obviously Planar Power, all of the casting ones (like Subtlety etc). I haven't used a pet for a number of levels but I'm thinking about getting the Pet Control ones too and hopefully add some dps, but I dunno how gimpy they are at this stage of the game. Higher up there's plenty of mana ones, mez and charm specific as well that will definitely come in handy. I also picked up all of the combat ones, as you can never have too much hp, mitigation and avoidance.