The new server is working great–it’s got plenty of power and has been rock-solid stable. I ended up with Debian on it, and I’m a lot happier now that I’m running testing instead of stable (for instance, I have FLAC 1.2.1). I’ve been running the 6.5.5 nightly builds of SlimServer, upgrading every week or two as I think of it.
Power consumption is a little higher than before but still pretty low. I haven’t fully taken advantage of the throttling the CPU can do yet–I haven’t had the time to investigate what the stock kernel does versus the various mods that VIA makes for the kernel and what they do.