Your best bet then would probably be the Auzentech Prelude as it has all the outputs. Sorry I can't do a ton of research for you as my internet is consistently dropping and can barely surf. That's not hard to find used at all. Hell I'm going to have one for sale shortly as I just picked up the rest of the parts for my new build and have the STX as well as I listen to headphones mostly or strickly 2 channel.
Scroll to near the bottom...
Auzentech, Inc. Sound Cards. Audio You Can Believe In. World First soundcards for Music, HTPC, and Gaming.
Edit: From the webpage...
- Four 3.5mm 8 channel line output connectors in rear panel (FL/FR/C/SW/RL/RR/RSL/RSR)