Plantronics makes a basic gaming headset that can be picked up for around $25 on-line. Ill tryt og et the actual model number, but they are the low end of the stick for their line. But still use the same drivers as most of their other headsets, just without the extra fluff features.
Ive been useing them for about a month around the house, and for gaming, and for the local LAN.
Imaging is good, bass responce is decent enough where it needs to be, and most importantly, they are light weight, and comfortable to wear. Infact my Fiance who generally has a ahrd time wearing headphones (due to neck surgery), insisted that i also pick her up a pair, becuase they where the most comfortable headphones shes tried on.
It has an excelent quality mic (duh, plantronics), terrycloth like, velour ear pads, and a rubber floating head grip band.
I would say the ergonomics, and the sound quality, and overall general quality, are far greater then that of the Senheiser gaming hedset. And for less, as well.