RDA are probably the easiest thing to work on ever just so you know, especially if you don't intend on using SS mesh (no dealing with shorts), so you may not want to rule them out.
That IGO-L has a very large platform to work with and I believe it'd look great on a provari.
And for a finishing look, check out the Pro-Rings & Hippo. Pro-Caps are better for delivery systems that use a side air hole (they'll restrict airflow on carto-tanks & Vivi Nova types, they also won't work with smaller diameter atomizers/RDA IE the A7). The Hippo has controllable airflow so that won't be an issue. Gives a nice Hybrid look to the 'Vari.
Pro-Rings
Hippo Cap - 405 Vaperz