After trying a few different setups, the CE4 clearo, the Vivi Nova, and now SmokTech tanks and locking tanks I've become a fan of them with different cartos for different juices. I enjoy the lower resistance ones for fruity flavors, and the higher resistance ones for more bold and tobacco flavors.
If it is your first tank the Vivi Nova is the easist to maintain, fill, and replace the heads by far. Much less mess and stress in comparison to some tanks that use cartos (unless there is a fill hole available which I have yet to try yet). I'd say shoot for that as a good starting point. I enjoy mine