If you like light flavors, and if they still make it, Alice in Vapeland's Call Me Vanilla is really good. It's one of their "frosty" juices, though, so there's a hint of something almost mint-like, but if you let it steep, the mint takes a backseat to the vanilla. I think the description is something about a vanilla ice cream cone, and that's pretty much what I got from it after I let it steep for a couple of weeks. I liked Virgin Vapor's Naked Vanilla, too. That one was a really pure vanilla if I remember correctly, but it got almost too sweet or something after a while, so it wasn't one I could chain vape.
I love Call Me Vanilla