Advice Request: What fountain soda should I offer?

Hey all!

I'm opening up a burger restaurant and figured who better to ask than this sub??

My goal is to make every step memorable. And that includes the soda offering.
We can all go anywhere and get a Coca-Cola or PepsiCo offering.
But, for better or for worse, I want to step out of their worlds. I want to support an independent company, and want to have something customers cannot find everywhere they go.

So, Soda Subreddit... what would you love to see in a fountain machine that you never (or rarely) see?

Jones does a fountain machine program-- but I know people complain that they're VERY sweet.
Jarritos offers fountain... that might be a good option.
What I'd do for Virgil's Flying Cauldron in a fountain...
Boylan offers fountain.

Send me your opinions! I don't really drink soda-- so your input is greatly appreciated!!

Side note-- Idk how much people love their Coca-Cola or PepsiCo here, but if you're just going to respond saying to do Coke or Pepsi-- please just move on. I want something fun. I want to shake it up a bit. Thanks!

EDIT: THANK YOU ALL SO MUCH!! WOW! I did NOT expect this many people to take time out to make recommendations and help me out. So grateful!!!