I'm at my max of 37. Break down is: 32 to fill out a platoon of 36 (the other 4 being squad leaders represented by Tantive IV troopers,) 4 are custom Lts (Imperial rankings added to the armor) and 1 to stand in my Vintage/Modern counterpart display.
With 16 Tantive IV stormies, 59 VOTC Stormies and 37 Cleaned Saga Stormies I have a total of 148 Stormtroopers (including the 4 officers) making up 1 company of 4 of my official Imperial Battalion. Well over 210 if I included all my Commtech Stormtroopers and excess cleaned Saga Stormies I have up for trade.