I'm not sure if I can help much more because what I have looked at needs to be a gaming card to work in the computer. The connection to HT is an afterthought. That's why I was looking into the Audigy 2. It would be kind of expensive for you to go the same route. I'll keep my eyes open if anything else pops up.

I prefer to use a standalone DVD player, as they tend to be better and last longer. I do have a DVD drive on my computer, but I prefer what you can get out of standalone player more.