A good place to start is a cisco 510 from avid vaper. Cisco 510s ship without primer so you don't need to clean them before first use. Cleaning after you've used it for a while is as easy as blowing it out and then giving it a 1 hour soak in some vodka and blowing it out again. --- After an atty has aged, it often collects carbon on the coil. Dry burns take care of that. You'll want to use the search box for
threads regarding dry burning. Dry burning can reduce the life of an atty if not executed properly (and sometimes even when executed properly).