Sorry to burst your bubble, but buying either of those sound cards is a joke to use with a Razer Tiamat; not trying to be rude either.
First of all, the Razer Tiamat is a gimmick, 10 drivers packed together don't offer proper sound quality and you're ears don't work that way with that many drivers pack together.
Secondly the quality of the sound drivers is compromised, meaning very cheap quality sound drivers; you can't offer 10 high quality drivers, or medium quality, for 180$ dollars.
You're much better of with a real set of cans(headphones) and virtual 3D(Dolby or CMSS-3D) paired with a good sound card like the Titanium HD or Xonar Essence ST.
When you use creative sound cards, you want to use PAX drivers.http://www.paxyoursoundout.com/Home/