I could write you an a4 sheet of all the tans I have tried but it wouldn't help you that much.
You really need to try them yourself, if you are definately going to offer spray tans it would be a good idea to buy your machine then get plenty of different tans to try.
I tried about 30 before I stuck with Vani-t.
Theres an awful lot to consider when choosing a tan
Colour, smell, fading, price, strengths available, is it quick drying, customer service of the company, delivery, add-on products, etc. etc.
Good luck, there are hundreds of companies out there.