Never thought I'd want to get into rba's either. But than the search for the great Vape grabbed me, before you know it I'm wrapping coils, boiling cotton and hemp, and even mixing my own juices. Fair warning though, once down the rba path you go, forever will it influence your vape!!
I never explored cartomizers, felt they were to much like the cig-a-like carts, and kind of old tech. But many claim they are great. I got into bcc atomizers then ventured into rba's. and now there is now going back. The Aspire BDC would be a decent atomizer to get, great vape, changeable heads, low maintenance.
The Ibtanked is a popular cartomizer tank, but can neither confirm or deny this. The Russian, Kayfun, Aqua, Tailfun, Rose, and flashi are all fantastic rba's. There are some great rda's also, but not into dripping, like having tanks of juice, not a bottle with an eye dropper. Look what's available, go with what looks good to you. Lots to choose from. Good luck.