Hi it's me again,

As I explained in my previous post we are expanding and I am also looking for advice on roaster.
I will definitely go for a drum roaster, but their is quite some choice out there, so could you please share your experience on what to look at for a good roaster.

-I think I will go for a gas one, what do you think?
-I know there is some modification to make on the coffee roaster but could you please tell us which ones?
- And about the size, someone told me "If you think you need 10kg go for 20kg" What do you think about that? Is it wise to go for a bit bigger than you think?
-Any model or maker suggestion are of course welcome  

Again thank you so much for sharing.