My experience with anything other than Rebuildables it pretty outdated, but I loved my Carto Tanks. They do have some issues though, so you'll have to do the leg work to find one that will work for you, if that were the route you wanted to go.
A carto tank is basically a carto with a hole or two in the casing that allows the liquid in the tank to feed into the filler material. Then the filler material feeds the wick, think of it as an expanded juice reservoir for your carto. They work pretty well, unless you apply too much suction, then they flood, and when they flood it's usually pretty bad. But if you don't have enough suction, you'll get some dry hits. Also, since most of them are sealed on the ends with O-rings, if you grab the device wrong, they have a chance of coming off.
I was in a restaurant with my girl and I was adjusting my PV in my pocket....top of the carto tank came off and Woosh! 5ml of liquid all over my pocket. That was lovely. I think they make threaded tanks now though...I'm not really sure.
Like Katya said, Rebuildables are in their own catergory. They have a steep learning curve, so, unless you're ready to learn about a little electrical theory, and handle wick/wire, I'd steer clear. They're fairly intimidating to start, and you'll make mistakes when you're learning to build them. Every new RBA that I get, I spend at least a week learning how it likes to be coiled.
Cheers!
-X