OK, so the new plan:
Cardhu the Mac mini as the web server, maybe running off an external firewire drive (probably the 160 GB) for size plus longevity (?).
Oban the 1 Ghz Athlon with FreeBSD 5.X as fileserver with 2 200 GB drives in software RAID-0 (gvinum).
Springbank the old fileserver goes away/becomes new testbed.
Knockando the 867 Mhz PB 12" becomes dev/Mac testing/used more as a laptop.
New mac mini gets ordered when it would come with Tiger, used with the Dell FP2005W (need a name!).
Cosmo the Celeron 466 desktop becomes solely for Erin's work and a 2nd browser.