My setup is a Astro Mixamp Pro (came with my Astro A30's) and recently bought the HyperX Cloud II. Optical to Mixamp, then plug my headphones into the amp along with an Astro chat cable to my controller. Sounds superb. Way better than the A30s.
This chat cable (got it from my girlfriends A50's, the stupid chat adapter breaks too much): http://www.astrogaming.com/ag1-cable/3AA99-XOU9X-869.html