I'm considering doing a Hermann Göring Panzerkompanie from
Fortress Italy and plan on taking two full units of Panzer III M's (don't worry, I'm taking a full unit of Panzer IVs as well

). I have the option for -5 points to upgrade half of the Panzer IIIs in each platoon to N's. This drops the rate of fire from 3 to 2, but gives the gun smoke. Taking into consideration that I'll have a platoon of three Nebs for a smoke bombardment, would you recommend upgrading two, one or none of the tanks to the Panzer III Ausf. N variant?