Black Ops suggestions/perk questions?

The best normal set up is Attack Helicopter, Chopper gunner and Attack Dogs. But on places like nuke town it is better to have the gunship in place of the dogs. But on places that are closed up the best killstreaks might be Sentry Gun, Blackbird, and Dogs. Cuz blackbird will allow you to know whats around every corner. And the hardened pro perk causes more damage to aircraft and stuff and also reduces your flinch while being shot.