Hi, i have two fav devices:
Groove by SMOKtech, it is really unusual shape and size, but it feels very comfortable in my hand has a very big battery 3800 mAh, so usually it takes me about 2 days to empty a regular 18650 battery ( 2200 mAh ), but in this case i need 3-4 days. I like it!
And the other one is eVic by Joyetech, it's true that this device has a lot of unnecessary info, but it is reliable and it's good looking as well.
Now cartomizer: There is one brand from Netherland called Janty, they have this incredible puromizer Neo+, just for now it's not with replacement head that is a minus, but the taste is amazing and the vapor is like ... OMG...