Hab,
Just found your post,I use 2 250 CS units and keep them going hard.I found that just one unit would not cut it,because of the varity of meats we smoke.Look your menu over real good,then ask yourself if I run short on something and have another meat in the single unit smoking away,how long before I can recover the one that I am out of,and it's going to happen to you.Let your menu tell you what size or how many smokers you will need.
Good luck,and good smoking,
Papa Shaka