You have the PC350. I heard they were great, but I don't have a pair myself.
NCIX.com - Buy Sennheiser PC350 Gaming Stereo Headset 10-26000HZ 150OHM 10FT Black Noise Cancel Mic - PC350 In Canada.
I have a pair of Icemat Siberia which I like, but I'm starting to be annoyed by the mic (seperate from the headset). I will probably change them soon.