Thanks to everyone for all the useful comments and feedback.
So I have added the following fonts to the default section of the f8 base-x comps group for now:
fonts-ISO8859-2*, fonts-KOI8-R*, fonts-arabic, fonts-bengali, fonts-chinese, fonts-gujarati, fonts-hebrew, fonts-hindi, fonts-japanese, fonts-kannada, fonts-korean, fonts-oriya, fonts-punjabi, fonts-sinhala, fonts-tamil, fonts-telugu, jomolhari-fonts, xorg-x11-fonts-ISO8859-9-*, xorg-x11-fonts-cyrillic, xorg-x11-fonts-ethiopic
I hope that looks reasonable.
[*] I was wondering if we really need both 75dpi and 100dpi variants of the bitmap fonts installed by default for fonts-ISO8859-2, fonts-KOI8-R, and xorg-x11-fonts-ISO8859-9? Perhaps it would be sufficient to just install the 75dpi fonts by default and make the 100dpi ones optional?
Jens
PS I have been pondering lately if we should have a comps group for fonts? Perhaps that would be a good easy place to keep all the fonts packages together?