Given the above choices, I would go with the larger known brand(s). Arizona would probably be my first choice Jones second. I wouldn't go with Clearly Canadian as they have been a dead item for years and I have seen it reintroduced several times here to no avail.
I would start off with 4-6 flavors or so I wouldn't go with the full line of anything.
If frappuccino isn't very strong in yours/his area I would probably try the Havana Cappuccino as well. Get some racks and display it everywhere. Cold coffee drinks sell really well (why I do not know yuck), but if frappuccino is a strong brand they will have a hold on the market and more than likely it will fail.
If what you did yesterday still looks big, you haven't done much today.