Thanks everyone, for your helpful replies. I'm definitely considering
getting an NSLU2 in the near future. Does anyone know what RAID options
are available - I hope that the OpenSLUG firmware would let me run a
software mirror across a couple of USB drives? I think that's all I can
hope for. I'll go try to look it up.
I would still end up with a pile of boxes and cables on the shelf (which
is something I was hoping to avoid), but if it's reliable and affordable
then it might be an acceptable compromise.