Audio Interface PT 11

Hi, it's time I upgraded from PT 10 (not HD) to PT 11 so I can run 64Bit to take advantage of my PC's 32 GBs of Ram (Win 7 Pro 64-bit) I know I need to upgrade my old iLok to iLok 2 but I also use an older mbox 2 Pro. I don't need anymore inputs than the mbox 2 Pro because I usually record alone. In order to run PT 11 what Audio Interface do you recommend? Thank you

J.