Beda Fomm's probably my favorite out of the bunch, though there is a contingent which believes the game to be "solved." (a foolproof Italian plan)
Best things about it are (1) the way it treats armor's advantages over infantry at this time in the Western Desert. (armor can pin infantry relatively easily and is fairly difficult to destroy except with your own armor) and (2) the system used for modelling the morale of the formations. (when units are forced to retreat or are eliminated, their formation loses morale, making the outcome more likely the next time it comes up)