I would start by researching the incubator pages and if you feel it's not for you then I would buy what you think is best. Just remember, heat, humidity and turning are the most important things! I wish you luck!
Sorry I don't know anything about store bought bators but we have had great hatch rates with our homemade one. Is this something the class might be able to do as a project before hatching? There are a lot of incubator instructions on BYC. Just a suggestion