I would definitely back the LaGG-3 early series.
However, when considering the "might" of the VVS at the beginning of their war, Stalin was a fanatic for numbers -- just numbers, not actual capability.
The vast majority of the VVS when the Germans invaded were obsolete 1930s airframes, most biplanes, and most that weren't biplanes were I-16s.
What we're missing from an early war lineup would include I-15s, I-153s, SB-2s, IL-4s, and so forth.
Very true, however my reasoning with the LAGG-3 over the I-15 is basically both are bi-planes, I feel the LAGG-3 would be voted over both if it came down to it, mainly the LAGG-3 did some 340mph, however it was a horrible handler when it came as a fighter, completely outclassed by everything except the ME-110c.
If I had to add 2 planes in the game right now for Early War, I certainly want the LAGG-3 and the He-111, much as I would love to see the Tupolev SB - I highly doubt it would be out voted over the He-111.
If I had to make 4 choices, then LAGG-3, Mig-3, Tupolev SB, and He-111. All four were critical to early war in russia.
I think after the four get made, we could certainly go even more early war and go for the I-153's, I-15's, Gloster Gladiator, Fiat CR.32 and of course PZL P.7.
I really don't see a Polish campaign ever being done, however this is simply the Early War in russia (1941 to early 1942), I will make a bid for the French Campaign next, I certainly want to see more Early War periods in the game.