Using Macbook Air as audio source

I would appreciate advice for a budget Audiophile. Plan on using my Macbook Air, 4 Gb RAM with external hard drives, iTunes, Bit Perfect) as a dedicated source for digital audio. Exposure 2010S, Def Tech Mythos speakers, small Apt space. Considering a used Ayre QB-9 DSD as a DAC. I realize the Macbook Air or any laptop isn't the OMG Wow, best source and would appreciate advice.