Actually Radeon 9600 is also supported in ATI driver (as are some newer ATI cards). I actually used to use one in my AROS box. SBLive is supported too. Coincidently its also the sound card I use for AROS. Seem to be a few of these "why dont they just support......." type threads lately in regards to AROS, which seems a bit unusual to me, as its not all that difficult to put together a fully supported system (athlon 64, gf5900,sblive, intel 100 pro nic in my dedicated AROS box, all supported in native). What I think could be useful is some sort of website that lists what hardware is supported to what degree. This way people could put together an AROS system without worry about things not being supported. I also think a bare minimal custom linux hosted version would be good (just enough to host AROS and have linux invisible to user (ala amiga forever/amithlon)) as it'd make a lot more hardware available to AROS users.
Just my 2 cents :-)