I use Pred Missile, Airstrike, Reaper
I mostly only play Domination, so landing a pred missile / airstrike on or around a flag being captured as well as gun kills is normally quite easy to get a few kills, enough to get reaper.
Care packages I avoid as kills obtained for killstreak rewards from care packages dont count towards your total kill count. Also takes too long to wait for package to drop. In the meantime, flags are being captured.
I normally get at least one reaper in a game, often 2 and on rare occasions 3.
My killstreak is at 21, but have counted 35+ with repeat packages (dont count second time round).
No moab's for me yet, but one day hopefully. I am an objective player so get killed a lot sometimes trying to force the game and capture flags.
Having said that, I almost always finish top overall and win most games which is my objective in every game. Kills and score are nice to have, but the win matters most to me.
Bit crap when your teammates dont have the same attitude and run round like headless chickens trying to get kills, or camping in the middle of nowhere hoping for easy kills. I wish these people would go play Team Deathmatch!
Attack helicopter and/or strafe run are ok, but useless against players with blind eye. I believe most decent players will use blind eye. Also, Attack Helicopter in particular is too easy to shoot out of the sky so sometimes is down before it has even shot at someone.
I have played games where every player on the opposing team is using blind eye, so rendered strafe runs and attack helicopters completely useless.
I did used to use Strafe run in the past, but I have pretty much moved on from that now and will most likely never go back.