I'd have to agree with Vinkman.
D7 is almost the spit 16 equivilent.
Good all around plane with 500 rpg makes it a killer.
Dr1 for pure turn, but watch the D7's sneaking in your 6.
Camel is midway in turn between the Dr1 and the D7, but has light ammo load.
F2b has single forward gun, but it does have a rear gun that can be effective 400 and closer.
Turn a time or 2 with them, extend out, jump to gunner, rake him at 300, then jump back to pilot seat and turn again. Rinse and repeat.
All of them are easily capable of 3 - 7 kill sorties.
The limiting factor is SA, and collisions.