Mt. Baker's Butter Rum. It's relatively unsteeped and tastes like cream soda out of the mail box. It's really smooth. The fluid is pretty thin. I just flooded a cartridge.
I dripped a little Backwoods Brew's Malty Taffy and Casablanca, but they are still premature. Now I know what that "perfume tastes" is like. Aside from that they all play well with eachother.
I have some thug juice and orchard frost I tried last night and those go well together as well. They are both fruity menthol.