I'd say the Auzentech Forte as I have one and it's amazing for gaming. I also swapped out the OpAmp for a Burr Brown one and damn it sounds amazing. Plus, I don't know if you have super high end headphones or something, but the built in headphone amp is always a bonus.
To my knowledge, the Asus cards are more focused towards home theatre setups. I'm not saying they're bad for gaming, but I think an Auzentech card will do you better for gaming. Forte or Prelude, they're both good.
Depends on if you are a fan of EAX or not. But my vote would go for either the Xonar Essence STX for headphones/2 speakers or the Xonar D2X for 5.1/7.1. Although the Prelude/Forte are comparable cards.
X-fi titaniaum works great, but you lose Dolby Digital Live and DTS encoding with windows 7. Was a big let down for me as I either have the option now of simulated surround or 2.1 mode which sucks because i have a very nice Polk 5.1 coupled with a Harmon Kardon reciver which sounds absoulutly amazing when running DDL or DTS encoding. The part I really dont get is my old gigybyte am2 board had dolby digital live encoding working just fine with windows 7, but the creative package doesnt.
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