What I'm vaping these days is Micro Core replaceable bottom-coil clearomizers. They give a huge flavor boost over the previous clearomizers I was using. There are bells and whistles available, but what I actually like best is the cheapest plastic clearomizer with the basic replacement core.
On the battery end, I never warmed to variable voltage batteries. But I love the new variable wattage. There are lots of these now. My favorite is a 20W eLeaf iStick (includes a 510-to-ego connector). But you can find standard ego-type variable-wattage batteries, too. These are set-and-forget. I set them to 9.6W, and they vape great with whatever clearomizer I screw onto them.