Evangelist said:
best atma's for something simple like exping
You probably wont be able to hold hate unless it's a really gimp party. You may be better off as a puller or as someone holding all the extra mobs. If you're just gonna go at it and melee then just get 3 DD atmas RR/VV/GH/Apoc or something along those lines.
If you're going to go pull, look for a movement speed atmas, if you need it, and -pdt or absorb damage atmas. lion, Heaven, aquatic ardor, and Savior(tho you probably wouldn't need a list of atma to hunt if you had that) are all good for being a puller.
I've pulled as pld a number of time and with a good -pdt set, a nocturnus helm, Aquadic Ardor, and Savior it makes for some ridiculously big pulls which can be entertaining in its own right.