DAC upgrade assistance needed

Hi all,

I've been out of audio about 4-5 years. The DAC I own is a PS Audio Digital Link III.

Now, I want to get into computer audio with my MAC desktop. I'm only seeking to play digital audio files via iTunes/Pure Music via my home system.

What's a cost effective more modern DAC to upgrade to from the Digital Link III? I was considering the W4S Dac-2 @ $1500. Is there any other product I should also consider before pulling the trigger on the W4S Dac-2?

Thanks to all in advance.