1st choice would be BoB 1941.
2nd through 10th is anything that doesn't have VVS fighters.
But I also sorta liked that 'relaxed' plane set we had recently...all the 109s, most of the 190s versus all the 47/51s and even the 38 and 40 thrown in for fun. I have no idea what that was called but it was pretty interesting as a change of pace, not for a full-time relaxed setting though.