The BeoPort connects to your computer's audio output and USB. You then run a single MasterLink connection from the BeoPort to your BeoCenter/Sound. The BeoVision itself won't be able to drive the BeoPort without a BeoSound or BeoCenter to go with it.
Unless you're thinking of getting a BeoSound or BeoCenter, the AppleTV + iTunes route may be a path to look at. You can drive it with your B&O remote as well, plus you can get photos and movies onto your BeoVision.
Or, your third option is to wait and see what the supposed 'BeoMaster 5' due later this year is going to be like. It sounds very interesting from what I've heard...