1. Upgrade Processor to G4/500 (Sonnet Encore)
A good option but also look at the G3/800 no drivers or anything. Take a look at
www.xlr8yourmac.com recent test. In general the G3 is a better value than G4 but you do mention several AltiVec enabled apps so I suggest you look carefully
2. Increase Ram to 640mb
Oh yea!
3. Upgarade video card to somthing like ATI Radeon 7000 32mb PCI
Why bother the ATI 128 is plenty for 2D and such
Would be grateful to get anyones thoughts on thoughts:-
1. What sort of performance boost will I get.
About a doubling
2. any other upgrades should I consider or not bother doing.
3. Graphic Card what are the options and is it worth doing.
The ATI radeon 7000 is really the only one, the original PCI Radeon is a better gaming card but for your applications I really do not see any point in uppgrading. As you do not have AGP you can not get the QE acceleration by Radeon anyhow.