Thank you, six, for sharing the results of all that research you conducted!
In addition to the Boge and Smok Tech Dual Coil, you may also want to check out the Smok Tech 1.7 ohm Mega
Single Coil cartomizer (aptly nicknamed "The Resurrector" by
Crystal Clear Vaping, because it brings new life to the 3.2V eGo). The dual coils don't hit hard enough for me on 3.2V and barely hard enough on 3.7V (e.g., as delivered by my NoEgo). I've just ordered a $12 Riva SE batt (supposedly true 3.7V, starting at 4.2V fully charged) from Liberty-Flights to try out with my dual coils.
And I have recently discovered a brand new PV: the
Elite 808 from CigEasy. [I just posted my review
here on ECF and on
Vaping Guides.] I think the Elite cartomizers (2ml-capacity, Kr8-compatible) are fantastic. They work so well on the Elite batts that I've not gotten around to trying them with adapter on 510-fitting batteries. [Yeah, I know this thread is about how unimportant batteries are.

But I did also say I like "an attractive, comfortable-to-handle package."]