Any exchange, even Yobit, can do what you want.  Poloniex isn't bad, and they're one of the most reputable nowadays.  The fees on both Yobit and Polo are pretty reasonable, just don't keep any coins with them.  Then there are Chinese exchanges...but I'd stay far away from China if I were you.  They're doing some major 'renovations' with respect to crypto and the law.