Well, it depends what you want. Do you for example need any special features like real-time filters and transitions or would a basic "capture" card do the trick? If you're after a basic card, I think anything will do as long as it is OHCI. For the real-time and more pro cards I'd turn my head towards Canopus products. I don't really know what's hot today but Canopus DV Raptor-RT was once in my plans but then I got mingy ...