Was just kidding around ;-).
I have several RDAs, right now honestly my fav is the topper off the UD AGI that I bought for like $11. Haven't even set it up in gene mode yet because the dripper is just that good.
Maybe get a topper with 3 posts and adjustable airflow like the Trident? You can set it up as a single or dual coil and either a single air hole in different sizes or a dual air hole. Personally I'm still trying to make myself like it but so far I don't. I like my AGI and the other one I like was also super cheap, the Scar from Smoktech I think.
Keep in mind all the 2 post RDAs I've seen still have one post in the center (positive) running right up from the 510 connection and then another off towards the outside (negative) so you don't really gain any room for building with 2 vs. 3 posts from what I've seen so far.
The units like the Kafun are a whole differnet ballgame of course...lol.