This is the hardest question to answer right now. I usually base my answer on two bits of information you haven’t given me yet:
1) What computer are you using right now?
and
2) What are that computer’s shortcomings? i.e. How much longer can you stand to live with it?
Both of these questions boil down to this little saying: “If you NEED a computer right now, get a computer right now.” That’s just as true now as it ever was. If you’re working on an etch-a-sketch right now then yes, go out and get a G5. It will serve you well for years to come and you won’t regret it.
But if you have an “ok” computer right now…one that gets the job done, even if it is a little slow, then I’d suggest waiting. Try to make it to 2007. The Intel Powermacs will probably be here late this summer…try to wait for January or whenever they get slightly upgraded or improved upon and buy THAT model.
So obviously those are the two options you always knew you had, but if you can answer those 2 questions up there it might help you figure out which one is best for you.