ASUS RT-N56U. Got one at home. It can update dynamic DNS for you (most unbranded routers can), but then goes on to add a USB port and a few "apps." One of them is a file storage host, and even file syncing (DropBox-like) app that runs from your own home.
Learn to say no to the equipment that your ISP offers you, the reason it's "free" is because it's trash.