Dual coil rocks.
Right now, I'm vaping on this one: Holds 90 drops!
MadVapes 510 Dual Coil Stainless Cartomizer
I also have several of these filled:
https://www.litecigusa.net/ProductDetails.asp?ProductCode=510CLEARDUALCOIL I do like the clear. Makes it so easy to know just how much is in it. Do use a cone with it, since the cone helps to give the plastic support and prevent cracking at the base. The wife has cracked several of these with her 510 mega batteries. I've had none crack with the eGo and cone. The last cone I bought from Lite Cig fit over these without having to enlarge the end, though I did have to drill a small hole in the cone to improve air flow.
These look really cool, and come in different ohms. I ordered some 2 ohm, but they won't be in till tomorrow.
MadVapes 510 Dual Coil Stainless Cartomizer
I don't care much for the Boge LR. To easy to scorch em, and they don't hold much juice. Find they plug up pretty quick with my VG juices as well.
Another thing I've found is these Dual Coil Carto's really don't drain the batteries all that bad. Even though they are working the battery harder, my drags are much shorter than with single coil carto's. Much more like hitting an analog...length of draw time wise. No need for those 3-4 second tokes.