I've got AIV April Moon in a Halo Triton tank as I type. I like it a lot.
That said, Ive tried them all, and I agree with the O.P.
Clearos for the win.
Vivi Nova mega in particular, 2.4 ohm @ 4.3V on a Vision 1300mah Spinner.
It doesn't get any easier (and mess, gurgle, drama) free than that for...