Should I upgrade my RAM? If so, to what lever
yes more RAM is always good!
few things to remember though:
since you have a G5 you're going to want paired sticks of RAM.
so basically i'd say you have three options:
1. 1x1GB stick (leaves possible upgrade to 2GB if you desire later)
2. 2x512 sticks (fills both slots but gives you 1GB)
3. 2x1GB (maxes out your RAM, but costs more)
and remember the more RAM you have the smoother your machine will run with more apps open or with large files in PS or what have you.