Im wondering what comp should i be looking at running.

My current setup is:

Tanks:
Feral Tank @85
Blood DK @85

DPS:
Frost DK @80
2xFire Mage @80
Destro Lock @85 (Does terrible dps tbh)
BM Hunter @ 80

This is what i cleared naxx with last night. The hunter was beyond annoying...although he pulled better aoe dmg.

Is it possible to run all ranged, and be successful?

I did level 4 DKs to 80 2 days ago as well. But im still learning how to control/split up groups.

** I just found out last night that moving my toons around caused a temp suspension on the feral druids account, untill i can email them ownership proof.