Well, 1st and foremost the ATV resamples everything to 16/48 before it even hits your DAC. Then the DAC Magic does it's thing (more oversampling). So, if you want to keep wifi in the mix you might be better off using an AirPort Express instead of the ATV or perhaps a streamer like the Bluesound Node 2 or the Auralic Aries Mini. Of course a new computer would be another choice as you mentioned. Good Luck.
Love my Bifrost Multibit too.
Love my Bifrost Multibit too.