when considering custom flavors that you haven't tried before, it's always best to call Geoff and discuss it. He knows his ...., is easy to talk to, and is very interested in making completely sure that you get what you are looking for.
i have seen a LOT of complaint posts where someone got a custom mix that they hated, and it turns out they could have avoided the frustration with a simple call or a lot of notes in the order comments.
I also like Poeia's idea of getting single flavors that you know you like, and mixing small amounts to test them.