I use Premium E-cigs and I really like them. They have a really wide range of flavors, and they vary in strength. I've tried a few (a lot of my friends use e-cigs too) and these are the ones that I like best.
Starter kit is about $80 I think, and then refill cartridges are 5/$10 or so. I go through 5 cartridges a week, my good friend goes through about 10.
I smoke only e-cigs and have for a while and my skin is a lot smoother, I'm a lot better at hiking (don't get shortness of breath nearly as fast), and I have more time to spend with my dog, since I wouldn't smoke normal cigs anywhere near her.
Also, if you do go with premium, I recommend the black battery, as the finish is easier to grip than the basic white one. the light is also blue instead of red, which I prefer. There won't be an option, just write it in the shipping instructions and they'll give you the black instead of white. They did it for me and for my friend
good luck