My wife is finally ready to upgrade her ProTank 3, and I'm so happy for her, but I'm not sure what to recommend, as I don't follow the tanks with pre-built coil heads.
I think she'd like to keep the coil cost down to what the PT3 is (about $2.50 per coil). She hits MTL, so the airflow would need to at least have a restrictive enough setting that could match the PT3 (very tight draw). It also needs to be 22-23mm to fit nicely onto her iStick 30w. She's not really into sub-ohm (yet), so the coil options need to be pretty diverse as well. A good capacity (~5ml) would be nice.
Ideally, it'd be cool if there was a rebuildable deck option, so if she ever decides to start building her own coils, she could do so. She's had the PT3 for over 2 years, so I wouldn't be surprised if she ran this new one until it disintegrates too.