When I smoked tailor made smokes, I would shoot for Marbs, Luckies or Cloves. Mostly, though, I rolled my own Bugler and later Red River pipe tobacco. It's hard to put a pack-per-day value on rollies, but I went through about 6 oz in just over a month.
I don't really have a staple flavor, though. I mix and change whenever the whimsy strikes, relative to whatever juices I have on hand. ATM, I have a 30ml bottle of Cinnabiscus (Cinnamon Hibiscus? tastes like Cinnabon) that i'm absolutely devouring. I just plowed through a bottle of custom DK mixed for me by Chi Town Vapor. That was pretty "dry", so I used it as a base and added some clove and mangosteen flavor.
If I HAD to vape only one thing all day, though, I'd probably find a good chocolate flavor and use that.