http://www.synthzone.com/sndcard.htm
Good place to find other options.
If someone has the time, they could make a GREAT list using this web site.
http://sounden.terratec.net/index.php?
Great options.
The Aureon 7.1 FireWire looks like a great option. Going to email them and see if I can find out more (like voltage outs). - found out through the manual that it's 2v outputs, which would work for many people on this site, however, I'd like a little more.
One of the main issues I'm running into, and I'm sure others will or have too is that on these surround sound cards, I need to know how the unit handles the sound. I'm not wanting surround sound in my car. I'm wanting stereo sound, how would I go about changing the outputs of the card to be what I need/want them to be.
For instance, take a 7.1 card.
You have RCA channels for Right and left for front, rear, and surround (that's 6 channels right there), then you have a center, then a sub, for 8 total channels. However, if I don't want to process the sound into 7.1, but would rather take the front for tweeter, rear for mid-bass, surround for mid-range, and sub for sub.
Going to see if I can get that info as well.