The Schiit BiFrost is supposed to be excellent. I haven't heard it, but I've read alot about it. It runs new $449 with USB input.
http://schiit.com/cart/index.php?main_page=product_info&cPath=0&products_id=7
http://schiit.com/cart/index.php?main_page=product_info&cPath=0&products_id=7