Hans, depending on your budget, you might want to go upnarket a bit
http://www.sirentechnology.co.uk/pro...roducts_id=550
Costs quite a bit more (might be less in the US) but Black Magic design are a very well known manufacturer in Pro and semi-pro video applications. Something you might want to think about if faffing around with USB isn't your style. I guess a lot depends on how much you have to do, but sometimes it is worth paying more for a pro product.