Personally, I wouldn't be in a hurry to get a second, different model of e-cig until I had been vaping for awhile. Frankly, it takes awhile to get used to vaping in general, and I think it makes good sense to stick with one model and figure out what you like and don't like about it . . . then you're in a much better position to pick a second model.
Unless you really dislike your current model, I'd make sure I had 3 extra atomizers on hand for that model (that is 3 in addition to the one you're using), and some extra batteries (minimum 3 total). I'd do that before branching out to a different model.
But, of course, if you really don't like what you have, then by all means try another model. My point is that when you're first starting off, I think it's enough to get used to vaping in general and your particular model in specific . . . and then start figuring out what you want to add to your arsenal.
But advice is worth exactly what you pay for it . . . and mine is free.