I started vaping a month ago with Halo, and love the juice I've purchased through them. But I've heard great things of Boba's Bounty? Also, I used Blu disposables before I discovered the tank systems. I liked that flavor and found one called Domestic by Johnson Creek (makers of the Blu classic tobacco flavor) that is apparently strikingly similar. Any comments on either of these? I am not a fan of overly sweet things.
Give Boba's a try, get the smallest sample bottle, as it's pricey. My take on it is it's a dry, crumbly graham cracker and raisin, slightly acrid, with tons of vapor. It's not a tobacco at all, but it's very "cigarette", if that makes any sense at all. I'm letting mine steep more, all the comments I've read is that it gets better and better with age. Definitely not sweet!
I always found the Blu flavor to be almost a hazelnut, or cappuchino and hazelnut, so I'd say try some coffees out - there's hundreds of them, though.
It's hard to make recommendations, because flavors are different for everyone, and there's so many vendors now. It makes the Zamplebox more attractive for that reason, you get a bunch of flavors that you might not otherwise try. There's also eliquidsamples.com that lets you buy samples of a lot of popular flavors, and a lot of vendors do samples, like Halo does. I just ordered the "little bit of everything" from Alice in Vapeland, for that very reason - I can try a lot of different things, without committing to the price of a full bottle.