The title of this thread keeps catching my eye. For an RBA, a KFL+ is very hard to beat. For an RDA... it really depends on what you're after, vapor or flavor. I can't speak to the vapor side of it, but for flavor, even though it's a leaky little beast, the Magma is fantastic. If you don't go nuts filling the well, the leaking is under control, but fill it much over half full, and things are going to start feeling greasy and ejuicy. A Veritas is pretty good for flavor too, and is well suited if you prefer dual coils, though it can use a single coil very well; it's good for vertical coils either dual or single. I'm still very undecided on the Derringer. Flavor may be ok, but it may be too airy for me to really enjoy.
Andria