Here I am baffled at how I can/should connect the following:

Creative Sound Blaster Audigy 2 ZS 7.1 THX Sound Card
SpeedLink Medusa SL-8790 5.1 Surround Headset
Aego 2 Speakers

Totally clueless at the whole headphone amp connection, and I would rather not have to delve into the back of my computer to swap over from speakers to headphone.