I think it would be cheaper to get an a1200, than upgrading this a600 for this job. I would keep the a600 for classic games, as it plays nearly every a500 game made. And then get a a1200 or a a4000 for more serious stuff like audio editing and so on. Both the a1200 and a4000 comes with a faster cpu by standard and also a bit more ram and are easier and cheaper to upgrade later on.
The a4000 is probably the best one, but it is also more expensive than the a1200. An a3000 is also a very good choice if you can live without the upgraded gfx chip "aga"
