Well the regular Atlantis V1 tank is 2 mL which is the same tiny size as the Nautilus Mini.
You can easily find the Atlantis V1 for less than $20 these days and the coils are available on ecig.com for $11 a pack (maybe slightly higher as I ordered on sale)
I had a Subtank Mini and yes it does pop but there is nothing to be scared about.
The thing that drove me mad are the unbelievable amount of dud coils I would get in a pack of coils at least 1-2 per pack of 5 were duds no matter the vendor i purchased from. Majority i got from VapeSuperSaver.com and they are well known and quality so I know it wasnt them and more of an issue with the tank and coils themselves.
Besides the burn in period required to get rid of the fresh cotton taste on the new V2 coils they perform amazingly! Dont know if you would want to switch to the Atlantis V1 but if you do you will be very happy a much much much better experience than any ive had with Kanger (hope all this praise doesnt jinx me lol vaping products are so finicky)
I like to stealth vape as well have a iStick 30W myself in silver and a few months ago I purchased a MVP Pro 3.0 in gold for $40 on sale. I really love the long lasting battery of the Pro 3.0 wish it was a little smaller and easier to hold but it doesnt get the tank as hot as with the iStick 30W so that i appreciate as well
As far as juices go I recently found what has to be the best vendor I have ever tried. I used to do juice reviews (www.vapewithape.com) but are currently working a medical licensing course so I had to take a break from that. Out of the over 50-60 vendors i tried (didnt do reviews for most of them bc many were so bad or I just didnt care for them and had no time, i finally found a vendor whom i can say just makes the absolute best juice for me, a true ADV.
2ohm6 is absolutely wonderful. I tried him on a recommendation from another vendor and he blows all other juices out of the water. The two flavors that I love are True North and Quey. Just ordered 3 bottles each (expecting them to come in by next Monday). Probably my two favorite flavors ever, ESPECIALLY the True North. Do yourself a favor and at least order 1 bottle of the True North and 1 of the Quey. He does $9 a bottle with standard $3 shipping, tell him I sent you and he probably will give you a sample of a flavor you are not too sure of, personally im waiting on a sample of Mast to see if I like it as much as the others.
I tried BoomVang and Top Sail (the non mentholated version of True North) and while they are good they arent fantastic like True North and Quey.
Hope this helps and hope your experience with vaping is full of less problems and issues and more fun!