I am currently looking to buy the Audio Technica ATH-M50S for my massive music collection. I was wondering if it is worth it for me to spend the extra money and buy a DAC as well. I currently use my on-board DAC on my AS Rock extreme 4 z77 which has a Real-tech 898 codec on it. I also time to time use the DAC on my AV receiver, but the receiver is almost 13 to 14 years old. Would I be fine using either one of the DAC's I have? or is it worth it to buy a new DAC? if so any recommendations to go with this pair of headphones? preferably under $100USD. Thank you to all in advance.