User blog:Nbd/Killstreak Rewards

I have a problem with my highest killstreak, which is 16. I think it should be higher for my 1.36 kdr. I think the problem may be my killstreak rewards. here they are: care package, sentry gun, attack hellicopter. i think the predator missle is overrated because you get a guaranteed kill, MAYBE two, but if you put the sentry gun in a good place, and check on it from time to time from a good vantage point, you can get 3, 4 sometimes 5 kills with it. But i changed my 7 killstreak from harrier to attack hellicopter. good idea? and i was thinking of changing the care package killstreak, but i actually like it a lot. is a 4, 5, and 7 combo good? any thoughts?