there are plenty of good options out there. razers newer headsets are more robust than there older 1s (orcha and charachas are known to be physically weak and dont stand up to dropping very well)... so check em out as they do sound very reasonable. they are a little pricey though but there higher end offerings are good.
logitech make some decent headsets with the g35 and g930(wirleless) topping the quality range, stenhiser 555 or 558 are great and have proven history of being a quality headset maker. like i say there is a pretty good selection out there now.
dont even consider turtlebeach they are pretty much console orientated and as such offer lower quality at higher prices (sorry bigdaddy i cant agree as the set i borrowed were pants)...
also stay away from skullcandy and anything else that looks like they are designed for a techno disco...
if you were gonna look at headphones and not just headsets then i would suggest you look at the technica range... some very nice sound quality can be had but you will not get a mic...
but just remember what ever you end up with they will all depend on the quality of sound your pc can deliver. soundcards tend to be better shielded so will minimize or get rid of altogether any bleeding or interference that you would get from onboard sound...