I hope that HTC will concentrate on bombers, although I've read they require much more work to develop than fighters. Nevertheless:
Priority should be given to:
Heinkel He-111H-3
Petlyakov Pe-2
S.M. 79
Mitsubishi G4M2 Betty
I know we don't really need another American bomber, but it would be nice to have something besides the Ar-234 to spend buff perks on. So, I vote for the
B-29 Superfortress (nukes not included)
Other bombers:
Ju-87D-5 (the Stuka with 2 x 37mm)
Bristol Blenheim IV
Vickers Wellington
Ju-52
North American B-25C Mitchell
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We need more early war fighters, not more uberplanes.
I'd give priority to:
P-39 N & Q
Nakajima Ki-43 Hayabusa / Oscar
Lockheed P-38 E or F
Mig-3, Yak-1, or Yak 3
Other fighters:
Me-410
Bristol Beaufighter
F2A Brewster Buffalo
Nakajima Ki-44 Shoki / Tojo
Kawasaki Ki-45 Toryu / Nick
Dewoitine D. 520
Polikarpov I-16 Rata
The Heinkel He-219 and North American P-61 Black Widow are very popular choices, but they are both night fighters, and until Aces High has night combat events with friendly icons only (that is, no enemy icons), I'd wait on them.
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As for GVs, I'd suggest the Sherman, the Churchill, and some kind of self-propelled artillery, 105mm size.
MRPLUTO