Though, even a 500Mhz G4 or even 600Mhz G3 would help considerably over the stock CPU.

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Yes, I would very much recommend the 500 MHz G4 - I got one for my Beigey and it's awesome, so fast and now runs all the AltiVec stuff like iLife '08. They can sometimes go for crazy prices though, which they are not worth as you can buy a real Sawtooth for that kind of cash these days and run Leopard - I only paid £3.20 including postage for mine, which is still more than my whole Mac is worth!