You don't need a webcam-charted mood-graph to tell you that gaming can be a frustrating, enraging experience. Unbridled rage only begets revenge -- lucky for you, then, that Corsair is beefing up its Vengeance gaming line-up. Its $149 Vengeance 2000 2.4GHz wireless 7.1 headset, for instance, hopes to help you suss out the location your foe with its optimized HRTF (head-related transfer function) positional audio chops. Failing that, you could always wrap your hardware in the outfit's new C70 PC gaming case, a rugged rack designed to look like an ammo-box. This $139 steeled exterior case has room for eigh