I only want to say this, I congratulate you on finding a headphone. My advice was not to get the Mad Dog headphones because you listen to rap aka bass heavy music. That being said, a good DAC increases the soundstage, makes sound more clear, and overall is a good thing to get. Your amplifier will amplifier a dirty hissy and overall rough sound from the internal DAC in your computer. That being said, consider a combo unit from Audio-gd, they make great DAC's and I'm very happy with my amp. Look for a Audio-gd amp/dac with the WM8741 if you want a warmer smoother sounding amplifier, or get Sabre ES9018 if you want a more neutral, better clarity, and somewhat better instrument separation amp/dac. If you go with Mad Dogs, which are neutral, go for a warmer, smoother DAC/amp like the WM8741 Audio-gd units. I recommend Compass, but I imagine you could use the lower end models or look for a used deal in the FS section.