Are you interested in an RDA or an RTA? The fogger is an RTA, not a dripping atomizer. As for your first RDA, you really can't go wrong with most of what's out there. Most RDA units have dual coil capability while offering single coil airflow. Do you want something with a reduced chamber to intensify flavor? Some RDA units have different ways of how the air hits the coil, like the mutation X diagonal holes compared to the infinite CLT slots. There's all different types, it comes down to how you like it opposed to performance, because they all seem to perform. I'd suggest getting a couple to try different builds. Magma is supposed to be great for flavor, Mutation X is supposed to be great for vapor production. The vertex looks nice because of the reduced chamber. There's a lot of options, check them out in video reviews.