FYI - I have already co-loaded JRiver Media Center on the AA and it works find - Thread here: http://yabb.jriver.com/interact/index.php/topic,104473.0.html

While I'm running both Volumio and Media Center at the same time on the original setup, if you wanted seperate configs, you could have two different SD cards to swap instead of the entire Pi

HT:M80,VP150,QS8,EP500 Outside:4xM3 Office:AudioBytes, Rumpus: M60,VP150,M22 Portable:2 x Airs