I use 20, 30, 40watt VV/VW MODs and a mech. If you find, and there are many, a box MOD it will most-likely be fine. You are not doing anything out of the ordinary unless you are specifically looking for big clouds. If that is the case, going up to a 100+ watts will be your joy. But, for good flavor, even 20watts is fine.
As to Rebuildable Dripping Atomizers (RDAs), there are many. I just got a Magma and it works well for me.
Take a look at the sub-forums for ideas.
Happy
vaping!