Wow so much info my eyes are bleeding. Jk this is something I don't understand at all.
There are quite a few of us on here that went the RBA because of the cost. There is also an added benefit of it tasting better. Atomizers that take pre-built coils have the benefit of being super easy... just plug in a coil and go. You have little to prepare, and when your cotton gets burned, or coil goes bad, you simply put in a new one. That's much easier on the road and can be done in less than 5 minutes.
With a rebuildable, if our cotton goes bad, it takes us about 5 minutes to change the cotton, and requires us to be close to a pair of scissors and some water. There's a learning curve for that. Once you get used to an atomizer, it can take about 10 minutes to make new coils which is done about once ever few months, and about once per week, we need to change the cotton which takes roughly 5 minutes. It is super in-expensive though. A roll of wire can cost around $5, and can last you for a year if you're frugal. Cotto can be just as inexpensive as well, and $10 can buy you over a year supply of cotton. So, $15, and you're good for a year for coils unless you like to fiddle.
Now, many people just don't have time, which I understand. But the flavor is better IMO. I can tailor the build to suit more of MY needs instead of buying a preset ohmage. For me, it's become a hobby.
Now, your tank was released a while ago. Unfortunately the industry, is more for change. If you buy most tanks, chances are the coils will be hard to get 2 years down the line. There are some atomizers that have been around for a bit longer. The smok TFV8 has been around for a while, and the coils are still available just about everywhere. I cannot predict the future, and I don't know if a bigger and better will come along, but for now, that is one that's been around for a while. Not saying it's the best, I am just talking about longevity which speaks of itself. The TFV8 is a juice guzzler though, and will produce a lot of vapor.. much more than your current setup. That seems to be the main trend, with pod (low vapor, higher strength nic) systems becoming more popular as each year passes. It's hard for me to recommend a tank, since vaping is highly customizable. What's big clouds to one person might be small clouds to someone else. So, I'd just recommend you go to your local vape shop and ask to see what they have to offer. Bring your old gear, and if you're concerned about getting coils later, make that issue known.
In either case, good luck. If you have any questions for us, feel free to ask.