+1. I tried A-400 early on and was disappointed with all the issues, but understand it's pretty solid now. May try it out again, but to be honest, as 600X3D is cheaper and performs well, I've been on the fence about retrying the A-400. No compelling reason over 600X3D for me I guess.
Re: Android and XBMC, I think we'll see decent boxes soon. But, these won't offer HD audio, etc. if local media playback is most important to you. But, as cheap, decent XBMC boxes, the next generation boxes may do the job.
HD Media Keen Videosaurus