Well I use MAC Studio Finish Concealer, it works extremely well and last all day I love it. And it last forever. It is 14.50 at nordstrom at the MAC counter.

Lightweight, creamy, discreetly opaque, M·A·C Concealer provides smooth, long-wearing, invisible coverage for all skin blemishes.

This emollient-based, lightweight concealer is so concentrated that a tiny amount can provide opaque coverage of the skin's imperfections and discolorations. It effectively covers dark circles, blemishes, moles, tattoos and birthmarks. Enriched with antioxidants (derivatives of vitamins A and E), it also contains silica to help adsorb the skin's oils. Concealer has an SPF of 35 and is available in a wide range of colors. It can be applied with a medium to firm fiber brush, a latex sponge or the fingertips.

But if you have dark eye circles you should consider using a green primer too get rid of the dark color.

Also this will help your dark circles....
http://www.bathandbodyworks.com/category/index.jsp?categoryId=2488781&cp=2484526

click on the link it has tones of under eye treatments all availible at bath and body works.

I love it and you will too I hope this helps!