i have the g930 and although i love em the battery life is poor. and unlike some other headsets where you can just put in a fresh set of rechargeable's you cant with them.
im at my pc about 12-15 hours a day so often have to recharge em while the pc is on. not cool. 10 hours may seem like as lot but if you work from home or play for long periods over the weekend the g930 may not be for you.
the stenhiesers are some of the better gaming headsets. there wired and give good positional audio. yeah they suck when it comes to music but there not designed for that. they are designed to give defined midrange where most game audio is set. personally i prefer the older 555's as they carry a little more bass. but the 350 aint that bad...
what i would suggest is you go to a store that will allow you to try a few pairs so you can get a better idea of the difference in quality...
just stay away from makes like turtle beach, skull candy and dre they really are just logo'd garbage... there so bad my old gembird headset gave better output from its 30mm drivers.
oh thats another thing. 40mm nimdim drivers are best for gaming. some headsets offer 50mm nimdims but i found them a little to bassy and prone to distortion. 40mm seem to be the perfect middle ground. and only get good quality nimdim magnet drivers. there are other kinds but they just aint as good.