You may want to try the USB Logitech headset H530 as it is for Mac and Windows:
http://www.logitech.com/en-us/webcam-communications/internet-headsets-phones/devices/7115
The mic works here as this is what I use to chat. Its plug and play with the Mac Pro. No need of drivers or any sound card. Costs about $50 dollars. Music or chat works fine too. Normally if you want a mic it is available only on the Apple cinema display which is more expensive
http://www.logitech.com/en-us/webcam-communications/internet-headsets-phones/devices/7115
The mic works here as this is what I use to chat. Its plug and play with the Mac Pro. No need of drivers or any sound card. Costs about $50 dollars. Music or chat works fine too. Normally if you want a mic it is available only on the Apple cinema display which is more expensive