I just bought a new monitor to hook up to my MBP and the monitor supports DVI-D and DisplayPort. I know my MBP has a mini-DisplayPort. I'm a little confused on what I need to get to support this monitor. It's a 21.5" Dell Ultrasharp with 1920x1080 display. So would a MDP-DP cord work, or do I need to get a DVI to MDP dongle?