What is your pvd? I'm into rba's. Haven't used a kanger product in many months. Your coil ohms will be dependent one what you are firing them with. Is your device variable? I personally use 80% VG in my juices, and vape at 15 watts. All my build on my rba's are capable of wicking enough juice at this level. Think the most you could push a pt is maybe 10 watts on stock heads, unless you rebuild your own coils. It should be able to handle 70% VG. Don't know for sure, like said, it's been awhile since I've used one. A kayfun, terminator, ithaka, fogger, most decent rba's are more than capable of wicking high VG juices, as long as your build is good. I mainly like my coils 1-1.4 ohms. When I used an ego battery and a PT, I preferred the 1.8 ohm coil heads. Get more watts out of them than a 2.2 or 2.5 ohm coil.
Without knowing the specifics of your gear, can't really give any good advice on recommended atty's. The Aspire is a decent choice. blows the PT away.