Ace Roto Mold 25 Gallon Vertical Dome Top Tank VT0025-18
Product Review (submitted on September 6, 2012):
I love these things. I use them for storing RODI water and mixing batches of salt water for my reef aquarium. They are solid build and do exactly what I need them to do: store liquid and look good doing it.
They even come with a nice bulkhead so you don't have to spend another $20 plumbing them.
Shipping takes a little while, so plan ahead if you are impatient waiting for the brown truck.