Pioneer N-50A

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If you're after something temporary, how about a Sonos Connect? It's not the last word in sound quality, and can't stream higher than 16/44.1, but makes up for that by being very easy to set up and use, and is inexpensive (less than £300 in standard form). If you decided later that you wanted something more sophisticated, it would fetch a pretty good price on eBay. You could even buy it there in the first place.