Russians only produced the T-34 as a medium tank, others were either prototypes or simply didn't see service like the T-34/85. You have either the Heavy Tanks (KV series and IS) or light tanks (Calvary) the BT-7. As for early war, the BT-7 was replaced by the T-34, however many were built and served on the front lines where its 45mm L/46 gun wasn't all that bad against Early war German tanks (Panzer 2s and Panzer 3s).
As for Aces high, I'd much rather see a few Soviet support guns added, Everything from the Su-76, Su-85, Su-100, Su-122, Su-152 were all major factors in the soviet army during WW2.
Given SP's like the Su-152 are based on previous designs like the KV series - it would mean we can get more tanks added quicker in game, rather then having entirely different designs.