Try Highbrow, Plume Room and the very good, rarely-mentioned-lately Kick Bass. Ahlusion's getting amazing press - I'm awaiting delivery on that one. All of those vendors will add extra flavor etc. if you ask, and more, as do many vendors nowadays, and they're high quality mixers. (Ahlusion has a blueberry honey - they extract their own flavors, as does Highbrow. Surprising how many juices out there are just dekang-based workups. Have fun!)
Oh, people really like Copper Creek fruits - I find them very clear and authentic but am not so fond of their more complex mixes. And that's just me of course.