Hey, what's the difference between all the v2 blank cartridges? I want to buy some but there are 3 different kinds and I'm not sure which one to get! I just ran into an E-cig city! It was like a wine tasting bar for juices!! Crazy! I bought some delicious five pawns juice called "gambit" omg it was soooooo good! Now I just have to get the proper blank.... Thanks!!!!