aww Mike, the Greensmoke is pretty good if you ask me BUT I refill so if I really think about it, I'm just using a battery that says greensmoke on the side! You can make something similar from any shady chinese site for 1/4 the price for sure. I have a whole pile of strange stuff I just got from China and it works better than I expected! 1/10 of the carts are hard to inhale through and have strange names and mystery flavors though. Nothing wrong with GS if you get the kit with the USB passthrough. Love that thing.
Blu is too small for a new vaper. Battery croaks on me in about 20 mins but I puff constantly all day long.
Find something cheap that has an appearance you like then modify it later with other parts. A good frankencig works and gives you options.