I like my M.A.P.
tanks.
Similar in construction to the Torpedo
tank, but is made of Delrin not aluminum...
good option if you want to try out this form of tank but not throw too much cash to just try it out.
They pop up on the classifieds every so often, so keep a look out.
To this day i have not had any leaks and that means a lot considering i carry it around in my pocket on a tube mod.
But at the end of the day, they all do the same thing... deciding factors will end up being based on price and aesthetics.
Good luck with your purchase.