I would get MacMini ( connect it to your MA7900 with optical cable) with player of your choice ( you may even like iTunes, but something like Fidelia do sounds better and will play WAV, FLAC, ALAC, MP3 etc), after warranty expires I would swap Hard Drive that comes with the MacMini for SSD which is one best upgrade you can possibly do to your Mac ( speed wise).. I would control whole thing from an iPad ( which acts as your MacMini screen, that just connects to Mac via your WiFi)