From my own experience... Kayfun RBA (or RTA) and Magma RDA.
From what I want to get... Orchid RBA (or RTA) - much like the Kayfun, but with dual coil deck and can use Kayfun parts. And Viking RDA - similar to Magma, but more room for juice and four poles instead of two.
Mine are clones clones clones clones clones clones clones clones clones clones clones clones clones clones clones clones clones clones btw.