Why even bother with streaming from the main PC/iTnes library when you could simply play music directly from an iPod via a dock/etc. Why mess with Airplay (etc.) when you really only want something quick and easy to use for listening. The apps are there for you too as desired. So my vote is, iPod touch connected either to a basic speaker dock, or, if you are interested in much better sound quality, to a full fledged AV receiver & speakers. Done.