Come on, anyone? I know nothing about amps or DACs...

At least two other members of Head-Fi asked the same question but never got an answer. I hope I can break the combo. :-)

I can't find a good answer anywhere on teh Intranetz, so I was hoping someone here could help me out.   Currently I'm using my DJ1 Pro's with a Macbook Pro 13" for playing 320 kbps mp3's, which doesn't give me the volume or sound quality I expect, so what DAC or/and Amp should I consider...