So I am no-prestige level 61 (I think). I use Harrier, and set my mind to get a harrier which will likely lead to my Chopper Gunner (pending map and my spot I run to for protection etc..) once I call in my chopper gunner (often use cold-blooded ) I always play with either Predator, Harrier, Chopper Gunner or Harrier, Chopper Gunner, Nuke if I am playing with my friend to cover my back when I am in the chopper gunner.
Although, I don't like the "being left on ground once controlling" a chopper gunner. I understand your using a computer (how you keep it with you and have kill streaks to enable it, I don't know.. but it's apart of life [in the game].
For prestige, I do like the idea of some of the titles you can get as well as the titles and emblems you keep.