If you don’t want to splurge, your best bet is this Joan Vass Tank. It's a wonderful piece, while not very costly. You might also want to check out this Caroline Rose Tank. It's an item you're bound to love which also doesn't cost the earth. You might also want to consider this Champion Tank. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're looking for something in between pricewise, look no further than this Caroline Rose Tank. This item doesn't cost a fortune, but absolutely deserves a spot in your wardrobe. In this price range, you can also consider this Equipment Tank. It's an attractive option both price and quality-wise. Alternatively, opting for this Misook Tank is a wonderful choice as well!
If you can afford to splurge, then you absolutely must check out this C/Meo Tank. This item seems costly, but it's well worth it.