I would suggest that you add the eGo ONE Mega series of tanks to your research list. Several "style" options available. MANY GS Air users have switched to them. The preferred coil for them is the CLR. The coil is rebuildable(no screws), rewickable or at less than $8 for a 5 pack you can just toss 'em.
You can find a great gang of characters here who'll be happy to bring you up to speed on these tank AND where to find a great deal on them!
eGo ONE tank series – CLR coil
After a quick search, I can't seem to find any sites that have it in stock. I'm google searching "eGo ONE Mega tank".
Okay, I found one.
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