If you are looking at getting into RBA:
I'd say get an RDA (Rebuildable Dripping Atomizer) with a single coil (airflow) option. Build over 1.4ohms for a better vape experience on the MVP. Drippers are easier to play around with the build on. With the Kayfun you have to drain the tank to see whats going on with your build. Also, Kayfuns need to be wicked perfectly. It's not difficult to do, just takes a few tries to figure it out. with the RDAs you can get your coil building down and play with some different builds before jumping into kayfun. For a first dripper I think these are good (depending on how you like the airflow, check out youtube reviews for more info):
Magma
Trident
Patriot
Kayfun is good, but RTAs are usually a bit more difficult to build than drippers IMO.
As far as clearo recommendations, I think Nautilus BVC is top dog right now.