If you're looking for a happy medium, look at this Tory Burch Tank. While the price is very reasonable, this piece is an easy wardrobe update. It's also worth considering this Joie Tank. This product is ultra popular and, just as importantly, not very expensive. Alternatively, opting for this Club Monaco Tank is a good choice as well!
If you're looking to purchase a designer item, take a look at this Milly Tank - a great luxury choice.