Battle of Britain II - Wings of Victory a/k/a BoB2
http://www.shockwaveproductions.com/bob/
IL2 1946 (plus all prior versions)
CFS3 + Firepower+ Over Flanders Fields
Falcon 4.0 Allied Force
LOMAC
Janes WWII Fighters
FSX + Shockwave's WWII Fighters add-on
All are good, all have merit but far and away my absolute favorite is BoB2. See SimHQ's review of the 2.06 update here:
http://www.simhq.com/_air10/air_293a.html
There is another update about to be released as well and for the first time they are actively working on enabling multi-player and are optimistic about getting that going. The AI is absolutely SUPERB and is the ONLY off-line game I can play over and over without getting bored because of it. The dynamic campaign (in which one can 'frag' into combat missions at will) is known as the 'Marianna's Trench' of campaigns because its so deep. For the more casual gamer, the Instant Action and Historic missions are great and challenging fun too. For the TrackIR users it supports full 6 Degrees of Freedom (6DOF) as well. Main Shockwave BoB2 boards:
http://shockwaveproductions.com/forum/index.php?c=5
maim SimHQ BoB2 boards:
http://www.simhq.com/forum/ubbthread...oard=75&page=1