I started out with an automatic (I think, I don't know all the terminology here yet) from Red Dragon. Was disappointed with the catromizers and minimal selection of flavors and nic levels. I then got a Tornado (which I think is the same as a 510) from Totally Wicked with a manual button. I like the Tornado much better! I get my juice from Velvet Vapors and their selection of flavors is great. I have been
vaping big time since I went off the analogs 9/21 and my battery lasts me all day and then some. The automatic with the cartomizer was not able to produce the amount of vapor or battery life of my Tornado. Lesson learned. I use the Red Dragon as my back up or if I am going to be
vaping in public (more or less...people get freaked when they see vapor and think it's smoke) it looks just like an analog too, where the Tornado doesn't. I much prefer the manual button on the battery for the Tornado because I can start it right before I use it and get a great TH and tons of vapor.
Good luck in your search. Everyone has their personal favorites as well as vendors of both e-cigs and e-juice. You will be so happy you have made the decision to go with an e-cig!
Happy Vaping!