Killstreaks in Black Ops

In Black Ops there are many killstreaks to choose from. I tend to use a spy plane, napalm strike, and attack helicopter. However if I am in an easy lobby or i am playing good I use napalm strike, attack helicopter, and chopper gunner. I like using smaller killstreaks becuase they seem to help me raise me KD which is currently at 1.77. I haven't tried many killstreaks, I am just giving you a couple of suggestions. You can certainly give me some suggestions or comment on killstreak awards that you think are better for improving you KD. Thanks! and remeber to follow me.