I accidently stumbled on how to make the missing choices appear: turn off your monitor when your Mac starts up! At least it works for me with my B&W G3, 17" SuperMac/Hitatchi, and 10.2. Note that I said "startup"; this means you need to turn you monitor off for restarts and (I think) logging in (I don't bother logging out on my home Mac).
Good thing I shut down Mac when there was nobody home (well, except for the cats) when we went away for the weekend. ;-)
[Editor's note: I haven't experienced this problem myself (I have 12 choices listed right now, the same as I've always had in OS X), but I know it's happened to others. Hopefully this hint will help, although I can't test it myself.]

