There's at least one fanatic who sells Atari 800XLs (and other Atari systems) on eBay, and he does things like test, refurbish, and update with HDMI interfaces, etc. I don't disrespect what the remake folks are trying to accomplish but I tend to think dealing with the refurb guy might actually be a more rewarding experience, with a simpler path towards getting support if it's needed.