For just CD based games you could get a USB one wire mod or a Neo 2.2 or 4.
But you'd probably be better off just getting one of the more popular, mainstream no-swap, direct boot everything type mods. As bighap mentioned there is the Apple line (Apple Mini, Apple Pro, there are more but I'm not too familar with Apples, though I believe my friend has one), Magic 3.1, Messiah 2 and the DMS3.
ALLERGY ALERT: The above post may be nuts.
N64, GBA, both un-modded.
NTSC U/C PS2 v4 w/No Solder v4 (SOLD, DRE... Laser Died
NTSC U/C PS with Plugmod (SOLD to pay for above