I currently have Sky digital I use a HCPC solution so I have no need for sky + however the boxex are better spec i.e they have s-video output which will be ideal for my HCPC and optical out to go straight to my AV amp. If I purchase a used sky + box will my viewing card work or do I have to then pay for sky plus ? If so wheres the best place to get them ebay ? what models are good bad etc. Thanks.