I'm assuming your dad isn't going to be big into gaming or music?
I've heard that Turtle Beach makes decent stuff. This one is right around the price range Turtle Bearch Ear Force Gaming Headset
They used to be the go-to name in high quality sound cards for a while (or so I remember, and I'm likely dating myself with that statement).
Honestly, I'd just look at Amazon or Walmart, or get him to alter his requirements slightly and get something like the Superlux HD668B
and a cheap clip-on mic. Sound will be infinitely better than any headset in that price range.
Hell...if he's desperate, I'll sell him an old Fatal1ty headset I have, provided I can find the detachable mic