Since today, I'm a proud owner of an SGI Indy.
AEC threw out a few, and thx to a hint from OJ, I was able to grab one including a 20" CRT display plus keyboard and mouse for a mere EUR 100,-. I immediately installed Debian over it, with the help from
this nice mini-HOWTO. Right now, the base installation is done, and I'm currently upgrading to Debian Testing, then XFree86 will be installed. Unfortunately, the disk inside the Indy has a size of only 1 GB, with 150 MB spent on swap (the machine itself has only 28 MB RAM :-/). But Debian is small enough to fit on this hard disk.
What I really like is the Indy's nifty boot monitor (graphical! you need a mouse to do anything!), and Linux's frame buffer, which currently runs at 1280x1024. This is especially nice on the 20" display. As soon as I'm finished with installing Debian, I will try to do some benchmarks, and then (for the first time) play with
dietlibc on another platform than i386.