+1 for a magma. Really nice flavour, doesn't leak much and the "infinite" clone is excellent quality as well.
Mephisto would probably be ok, it has a simple 3 post design. One of the things that makes it stand out a bit is it has huge post holes. I use 25ga wire in it but I'm not sure how a thinner wire would do. The airflow adjustment is nice and easy as well.
Other good simple 3 post design RDAs with reasonable juice wells include the Tobh, Stillare, Zenith.