Domination on groundwar is the best gametype. And for the map i would say wasteland or terminal. Killstreaks: pred missile, harriers, ac130. And just a tip on the ac130 if you dont already know it. Once you need to reload switch the gun right away.
i actually will say that if you spawn kill on demolition then get your AC130s then you can get 30-40 kills per AC130. And 5 or 6 AC130s a game. if your team knows how to spawn kill.