I also give a +1 to the Provari Mini
As an alternative to the Tatroe tank you might consider a Pyrex carto tank. They are also not very likely to break at the connection if you get one as wide as 19mm or wider. Although Pyrex is strong it is glass after all and is not indestructible.
You can get good Pyrex tanks at IBTanked.com. You even get a fully blacked out one for around 30 bucks.
All you need are replacement cartomizers, which last from a week to 3 or more weeks depending on your Ejuice and how much you Vape. Better flavor than the Protank coils in the Tatroe IMHO.
There is a bit of a learning curve in setting up (priming) a carto tank, but once you do, they are a better vape than the Protank type systems.
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