There are tanks that have stainless steel endcaps that have been designed to look customized to match with the Provari. First was the Vaporfexion Pro-V for about $65. The Kir Fanis Prive tanks sold by Avid Vapor took that a step farther, for even more money. All of these use a cheap polycarbonate tube that is vulnerable to cracking or melting with certain e-juice flavors.
Many people will say go for a Phiniac. No question, they are a great tank, extremely durable pyrex glass, with nearly unlimited potential to customize the glass with color sandblasted designs or frosted appearance, hand-blown glass designs, etc to make your tank uniquely one-of-a-kind. These can get pretty expensive, too, beginning around $50 for a naked tank. The Phiniacs are just a little wider in diameter than the Provari top cone.
If you like the Lava Tank acrylic-style tanks, Hoosier Vapes makes a carto tank very similar which allow the ability to twist off the entire top to fill the tank, similar to the vivi nova. In addition to the unique acrylic color patterns, Hoosier is now offering two stainless steel finishes. $50 - $60. These are called the Bella and Elegance Tanks. Quartz glass tubes offered for additional charge.
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Below is an Elegance Tank that I customized by matching a Phiniac glass tube that I had customized with orange sand-blasted designs.
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My current favorite tank for my Provari are the
IBTanked - Get Tanked With Us!. The slimmer of the two diameters he currently offers is a 19mm pyrex tank which I feel looks perfectly on the cone top Provari. Highly customizable like the Phiniac but with fire-cured paints. Available with either stainless steel caps of various colors or acrylic caps (19mm only) of various colored patterns. Tanks start out for only $20 each. You can get 3 of these tanks for the price of some of the above more expensive tanks. I did a full review of these tanks here:
http://www.e-cigarette-forum.com/forum/tank-reviews/349222-ibtanked-pyrex-glass-tanks.html
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XL and standard size IBTank's