Hi FYR, and welcome to CoffeeSnobs. Im an ex-Ontarian myself (Toronto and London)--where are you situated?
I cant comment on the roasters themselves, but on the going commercial and other areas, I can.
It really helps to have some commitment to purchases before spending up large if you can. The profit in roasting is enough to pay for the difference in roaster prices fairly quickly, as long as the discounts for friends dont get ridiculous.
If you have to do 4+ roasts a week on the small machine just to keep up with company orders and friends, and work at the same time, and roast for yourself, I suspect that that could grow old really fast.
Warning--going commercial can take a lot of fun out of any hobby.
What would be the minimum roast in the 10kg machine? Will you be able to do a personal quantity in it?--You may very well want to roast some special beans for yourself.