To be honest, I don't think there's really any "good" USB headphones. All of the headphones which sound really good all end up having 3.5" plugs on them.
You really didn't mention if you're looking for in-ear, on-ear or over-ear cams. Or, what they're going to be used for (e.g. gaming, music, etc). Sometimes knowing the application can help out a lot. For example, they need a mic?
Personally I have a pair of KRK KNS8400's that I use for general music listening, as well as studio recording. They're solid over-ear cams that have good build quality, comfortable for all day use, and have a relatively flat frequency response. Pair that with a little USB adapter and it would meet your needs nicely.
Anyway, post back if you have more input and I'll try to help out.
To be honest, I don't think there's really any "good" USB headphones. All of the headphones which sound really good all end up having 3.5" plugs on them.
You really didn't mention if you're looking for in-ear, on-ear or over-ear cams. Or, what they're going to be used for (e.g. gaming, music, etc). Sometimes knowing the application can help out a lot. For example, they need a mic?
Personally I have a pair of KRK KNS8400's that I use for general music listening, as well as studio recording. They're solid over-ear cams that have good build quality, comfortable for all day use, and have a relatively flat frequency response. Pair that with a little USB adapter and it would meet your needs nicely.
Anyway, post back if you have more input and I'll try to help out.