MS-406
D-520
Beaufighter
IAR 80/81
Early/midwar fighters? always get my vote +1
Don't care for which country or politics (i.e how many people) - frankly finger pointing which country "deserves" a slot is rather childish.
Not sure about the PZL P.11 - Fiat CR.42 Falco and Gladiator served in far more theaters then PZL P.11 or any other Polish aircraft.
With Gladiator and Falco you can have a Greek Campaign or North Africa both were vital to WW2, throw in limited 109s and Hurricanes and you have an interesting match up.