Following Karyudo's advice I've almost ruled out the canopus advc-300. Instead I am considerring the Sweetspot (PDI Deluxe) car or maybe the more expensive MPEGPRO card from canopus. As I don't know too much about video cards does the spec of this card look up to the job (I'd hope so bearing in mid the cost!)
http://www.canopus-uk.com/US/products/MPEGPRO_MVR/pm_MPEGPRO_MVR.asp