I would guess that your location and what is available near you as well as how much demand there is would greatly influence how well this operation goes..... I guess I understood that you were planning to either hatch eggs that you bought or buy chicks and raise them up to a maybe point of lay? And then sell them. Is that right? If so depending on your area, and what breeds you plan on, it sounds like it could work. I do agree with finding as many customers as possible before you start.
Keep in mind that shipped eggs don't always have great hatch rates and most times you will end up with half roos when you hatch eggs.
I am actually doing a similar project this year, I have a customer that is interested in getting new girls this year but Hates keeping them in the house and dealing with the heat lamp, so I have hatched some and he will get his pick when they are abut 2 months old. I was looking for a few exteras for me anyway and the eggs came from my flock so no big expense there. The roosters will take a trip to freezer camp. Best of luck with your project!
Sorry just realized that your request was for an incubator recommendation.
I personally run 2 one is a cheap Chinese knock off and does ok, provided I babysit it and watch both temps and humidity with at least one extra thermometer/hygrometer and make adjustments as needed. It cost me less than $100 and holds 56 eggs. My second bator is a brinsea ovation 56 ex with humidity pump...... all I can say is wow! I love that it holds the temps rock solid and I don't have to babysit the humidity. The brinsea is a little pricey.
Have you checked out the incuview? There is a whole thread on it and quite a few folks like it.