On my limited space desktop, I'm down to a pair of speakers and a compact Bluesound Powernode 2. If you look around, the original Powernode N150 is available under $400, sometimes closer to $250. It is controlled via wireless with a phone or tablet and doesn't even have to be visible. A pair of speaker cables up to whatever speakers you choose, easily hidden.
Plays whatever files you have on a mapped drive on your network, almost any radio station on the internet anywhere in the world, or streaming almost any service of your choice (except iTunes.)