Razer and Turtle Beach headset quality isn't that great. Best route is to go with a pair of headphones and clip on mic or mod mic.
I have no problems with my Audio Technica ATH-AD900 headphones and a cheap webcam (as a desktop mic).
If you're going for a headset, at least get a decent beyerdynamic one.
Sweet price on the nostromo. How hard is it to add cherry switches to it again?