Problem is that most of the tanks we'd want (to be competitive at least) are worth adding because they're late war or later in the line to where they'd be effective. Most of the early war ones were similar enough in size, weight and armament that one is as good as another. The only real differences (range, ground pressure, reliability, etc.) aren't really something that can be recreated in AH.
Thats not to say they shouldn't be worked in somehow- the Grant, the Lee, the Italian and Japanese tanks... all would be nice for a scenario, but otherwise would only be used by afficianadoes and those who like to use the "different" rides.
I still prefer my original solution to the prob though- its Aces High, why does it need AFVs in the first place? If I wanted tanks, I'd play Panzer Commander or Steel Beasts. Or WWIIOL.