The OP said that she went with V2 for her e-cig. I also did the same before researching, and many are mentioning the KR808, but V2 is already a KR808, and it's actually of good quality with good battery life, 250 mAh (4.2v that drops to 3.7v). Yes, it is a little high on the price, but I've seen much worse, and I'm glad I didn't get suckered too badly.
And as far as KR808 cartos go, you can just refill those.