I'm a StuG fan and I agree with glock, the IV 70 was a very nice tank (I think less than 2000 were produced though), but the StuG was a lot more common (over 10,000 (!) StuG IIIs and IVs were produced during the war) and should be added to the game's tank selection much sooner than this.
I'd like to see at least the StuG III G and StuG IV in AHII and maybe these other StuG III variants:
StuG III Ausf. B (320 produced)
StuG III Ausf. E (272 produced. slightly beter armor on the sides than the B, plus the first to come with a MG34 to help protect itself from enemy infantry)
StuG III Ausf. F (359 produced. the F series was the first gun upgrade for the StuGs, it brought the StuGs enough firepower to be considered a tank destroyer, where before it was only really an effective infantry support tank.)
StuG III Ausf. F/8 (334 produced. a slight upgrade to the original F's gun and an improved hull design over the original F.)
StuG III Ausf. G (the most common StuG of WWII, 7,720 Gs were produced (compare that to the 8,800-ish Panzer IVs (all variants) produced)... how is this not in the game?! as the G series was based off a new chasis copied from the Panzer III, 173 additional ones were converted from existing battle-damaged Panzer III chasis.)