2) If you use clearos, what's your favorite? (i.e. bottom coil, top coil, brand) If not, which one have you considered using?
When I use clearos, I use Protanks, or rather I use some parts from them. I usually wrap my own microcoil/cotton wicks when I do. I have a pack of Kanger heads for them, just in case, but they are less reliable. My wife uses the Ismoka BCC and they seem to be very reliable.
I have looked at the New Aspire, and the Aerotank, both with airflow control. But it is starting to feel like time to pony up for a RBT such as a Kayfun. The Protank 3 was a real letdown to me.