With your C2500 having a built in DAC all you need is a streamer, the best sounding streamer which also has the best app (conductor) is Aurender, the X100 is a streamer that comes in different sizes 4TB's to 12TB's. I think they even make a 2TB one now the N100.
http://www.aurender.com/page/x100
Matt M
http://www.aurender.com/page/x100
Matt M