I've haven't been fully following this thread.
Let me speak on a few things I've seen on this last page.
Aerotanks Pros:
-Holds a lot of juice
-Glass tank (Some Menthol/Cinnamon/Citrus flavors will melt plastic tanks)
-Adjustable Airflow
Cons:
-Requires cleanup every refill (about 30 seconds each time)
-Leaving it with juice in it in the heat will cause juice to leak out of the tank
-Taste isn't as great as regular Evod Tanks (My Opinion Only)
As far as batteries, buy them from here and let me know if you have any questions. I've been researching E-Cigs for months now and I know a lot.
http://rtdvapor.com/
I just bought 2 Sony VTC5's there for about $10.29 each and that's cheaper than anything on ebay and this guy is reputable and you won't be ripped off.
If you let me know what mod you have or which one you are thinking about, I can recommend to you what I think is the best battery for your mod (some heavy duty batteries will be overkill on some mods).