I have the Asus p8z68-v le. Its about 2 years old. Will it be worth getting the sound card with this board?

Is the sound card necessary? From my understanding, wouldn't a sound card that cheap make no difference? Pardon my noobishness if I'm completely wrong.

I'm looking to buy a pair of headphones. They have to sound good and they have to be EXTREMLY durable. I've had gaming headsets made of plastic that have been labeled as "durable", that I've broke. Also I know this isn't the place for this but if you could help me I would appreciate it (if you...