Get the PX250s. You won't be able to hear anything. If you work in a noisy/annoying office like I have occasion to, they're a lifesaver. "No, I can't get the phone. I didn't hear it." "Ah, I finally don't have to listen to the hold music playing (volutarily!!) through someone's speakerphone." "No, I don't have to listen to my coworker who should be getting me something to do selling ink jet cartridges to some shmoe off the street."

Oops, sorry, a little frustrated with work there...

I am the Doctor, and THIS... is my SPOON!