I agree with Peter. It will depend on volume, and that is a hard thing to speculate in the beginning. How long before I may outgrow the roaster?
A 2k model is considered a tabletop roaster. So that is a small footprint. But there are not too many that will actually roast a full 5lb.
I know that Roaster Authority now builds roasters that roast the capacity stated. I run an Ambex 10, glad I started with this size.
Looks like it will be a while before I outgrow it.
Diego and Kate, do you want to set the roaster up at the Farmer's markets etc? If so, Then I would suggest the 2k(20lb. propane & generator).
More work, but great sales enhancer. I know folks in the forum have done this, maybe some will respond.
If roasting at home or offsite, then I would not purchase anything less that a 5k. Just my thoughts.
Hope the best to you!