The latest Stereo Gaming Headset from ROCCAT is named Kulo, is very light (suitable for LAN Parties), and comes with an unique feature: the Automatic Mic-Mute; also, the in-line volume control is very handy. Even if it is an on-ear model, it's confortable even after many hours of use.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips