Well, I used to use Kanger Aerotanks 15 months ago. Some coil heads were DOA and an ohmmeter would show that. But, I had a couple that shorted after a few days use, too. So I think using prebuilt coil heads on a mech mod could be risky.
OP, I understand wanting the durability of a mech mod. I own and use several myself. I think if you want to continue using prebuilt coils you would be safer to buy another regulated mod. I've had good luck with my Sigeleis, and I rarely read about problems with them. Maybe the 30W Sigelei Mini would be a good choice for you. Innokin has a great reputation also. An MVP or Coolfire IV would be a nice choice, too.
If you want to eventually get a mech, maybe get an RTA as well with your new regulated mod and begin learning to build for it. Then when you are confident in your builds, getting a mech could be your next step. If you would like help choosing an RTA, feel free to PM me. RTAs are kind of my obsession...I mean specialty
I agree with both Baditude and Bad Ninja, and am throwing in my

Mr. Ninja sure knows his mechs, and Mr. Bad is our resident battery and safety guru, and I respect both of them highly.