So of course people have differing opinions on atties - but you asked!
So - coming from a protank, with a MTL draw, here's what I think:
1 - RM2 is a tried and tested atomizer, that HUNDREDS of people loved right away with their Reo. Great starter. I don't have one, lol.
2 - Cyclone is a great idea - and you could get standard AND AFC caps. The standard cap is a tight draw - but if you want a little more air, just like the RM2, you could drill the hole a bit. As long as the hole stays smallish, it doesn't leak. The AFC would let you open things up for airier draw - which you MIGHT WELL SHIFT TOWARDS. A lot of people do... You can also do dual coils. It CAN leak out the airholes though...
Other options - all naturally tighter, MTL atomizers and available often from classifieds or Chowderhead: Reactor, Divo, ERA, Hornet, PDA. Then there's also the Chalice III, possibly the end-game if you decide you're definitely not going to go the 22mm/big-air route.
Bottom line: maybe get an RM2
and a Cyclone, and take it from there!
Divo, Cyclone, CycloneAFC,Reactor, RM4/Atomic, Chalice lying down.