i run an arcam irdac which just plugs into the amp , music is kept in flac (and other formats) on a netbook which runs jriver/foobar (the netbook can be put in another room completely away from the hifi , all you need to do is switch it on ).
i keep an ipad in the same room as the hifi which has jremote and monkeymote on it - from these remotes i can access all my music on the netbook.
a bit different from a dedicated streamer but most ppl have a netbook /laptop and ipad / samsung tablet lying about these days.