Here's the equivalent section from my XF86Config (using X4)
Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "unix/:7101"
FontPath "unix/:7100"
FontPath "/usr/X11R6/lib/X11/fonts/misc"
EndSection
It seems to work fine: 7101 are TT fonts, 7100 the standard fonts, and
an explicit path is given for the 'misc' default font.
Try the TrueType Fonts in Debian mini HOWTO
http://www.dimensional.com/~bgiles/debian-tt.html
Cheers
Tiarnan