Miller is probably right, your priority now should be troop destruction and preparation of your winter defense line, rather than territory or Moscow.
The first and only priority in 1941, IMHO, is manpower. Pockets and Manpower Centres.
If you have any chance of taking out Moscow's manpower you should take it. Even if you only hold it for a couple of turns, you will put a massive dent in the available manpower to attack you during the blizzard.
In this situation I would push as far east as I could, forget about digging in. This is not the time to give the initiative back to the soviets. Even if you were retreated 1hex per turn during the blizzard, you could still have an excellent start line for 1942.
Panzers East!!!!