Neither a GF430 or a GT520 are good for AROS as gallium support for both is pretty bad. Even a Gefore5xxx or 6xxx will be much faster (same is true for gallium on any platform, not just aros).
As for Quake gl, aros has a few different versions and even has some of the super enhanced versions that are beyond the scope of MOS or OS4.
In regards to cd audio making an iso as suggested will not work as doing this means there's no audio cable plugged in to play the cdda files. This again isnt unique to aros.
