Sorry if I sound like a teacher now ;), but doesn’t your build depend on your overall strategy (and units available).
10Inf sound like a good build if there is such an allied (Russian) infantry supremacy.
Also 10 inf give you a lot of cannon fodder for both attack and defence.
i have done games where Germany lost the game in turn 1 because it won its initial games, but had to choose tanks as casualty even during attack and then Russia attacked back and could kill many of the remaining good german units.
I am an old style (pre revised AA gamer) and grand strategy said: Attack with a mix of INF Tanks and FTRs, but make sure that you have enough inf to survive the counter attack.
Revised is even more dangerous. drop a few Atry in and infantry (withouit) is even a good attack force.
I will hold final judgement until I get my copy of AA50 and have done a few trial games, but friom what is known national advantages and the posibility of reducing ones building capacity will certainly alter the flow and feel of the game.
Avanti Savoia :D