I hate to say, but I'm voting non-American all the way. As much as I'd like to see the P-39 eventually, we have more than enough US Iron and are sorely lacking on may other fronts.
I hope to see the 410 or another Japanese addition, but I can't see them lasting past the second round.
I don't see the He-111 lasting just because everyone will say "What can it do that the Ju88 can't" without looking beyond the MA into scenarious and AvA setups.
B-25 and A-26, would love to see, but there are far mor glaring gaps to be filled, same with the P-39 and Brewster.
G.55 would be nice too, but i'd rather see an Italian bomber before another Italian fighter.
TuPe and Yak, just not enough VVS fans to swing them.