Hi,
I think Efika is a great machine, because it required MorphOS.
MorphOS is the only Os, that really rocks on Efika.

To be realistic, linux has become mem hungry and 128Mb is just sufficient for special applications. (aka no Office-Stuff)
Mol isn't a choise either .....

QNX would be ideal, too, but it's expensive and very rare in PPC world's desktops..