Well here is what I would pick:
Heavy Bomber: B-29 because well lets face it it was the best and most advanced heavy bomber to see combat in WW2.
Light Attack Bomber: A-26B Invader because she could carry a decent bomb load of 6000lb and could pack a punch with all of her foward firing armament. Beautiful plane too none the less.
Fighter Bomber: Fw-190A-8/U11 because it was fast, maneuverable, and had great armament.
Dedicated Air to Air Fighter: Fw-190D because it was fast, manueaverable, was a match for anything in the skies and had good armament.