Based on your criteria, you may want to give serious consideration to the two-piece KR808D-1 with its cartomizer (integrated atomizer and cartridge). You just screw the cartomizer onto the battery and vape.
They can be refilled, but you can leave that until you settle in for the evening. A couple batteries and a few cartomizers will keep you going for a full day on the road. The batteries (auto or manual) are 280 mAh (compared to the 510's 150 mAh) and there is a very effective PCC available for it. And there is a 380 mAh extra long battery to really postpone recharging.
There is a broad selection of flavors now available in the cartridges and, as I mentioned, they can be refilled with whatever
e-liquid you want.
The KR808D-1 is known to have strong throat hit and flavor and good (if not superlative) vapor. I happen to prefer the (more expensive) GreenCig cartomizers, which also work with the KR808D-1 battery (automatic only, unless you buy an adapter). They deliver a tremendous amount of vapor and a smoother vape, but with less throat hit and a less intense flavor.
Some of the major U.S. suppliers of the KR808D-1 are
Vapor4Life (
Vapor King brand),
NHaler,
CigEasy (
Easy),
Mist-Stix (
Mist-Stix), and (most recently)
Puresmoker (
Ace). China suppliers include
Heaven Gifts and
Healthcabin. [As you may know, China supplier = low price + high shipping cost; works out well for larger orders.] NHaler is the only supplier
I know of for the
GreenCig carts.
As always: IMO
