I have the Cig2o Starter Kit (2 piece). What brands are compatible as I purchase more carto's and batteries? Do I have to stick with Cig2o products or can I use other brands? Can anyone recommend menthol flavored carto's that cost less than $15.00/5 pieces, or is that a reasonable price? I'd also like to order e juice to refill the carto's...any suggestions for a good, high vapor menthol flavor? Should I also order some empty carto's, and if so how do I know that they'll work with the cig2o? Finally, I read on ECF that Cig2o MIGHT be a kr808d-1 type...is that true? What does that mean and how can I benefit from knowing that? THANKS FOR YOUR HELP!!!!