Much difference in speed? G5 vs Intel

I wonder if I've been greedy..
I have an iMac 20" 2Ghz G5 ( 1.5gb RAM ) - I've just ordered a 24" 2.33Ghz Intel Core 2 Duo ( 2gb RAM ). And I'm starting to worry that I've been a tad silly!
Is there much of a speed difference between these two set-ups ? The benchmarks I've seen have been between Core 2 Duo and Core Duo chips - I'd love to see G5 vs Core 2 Duo...
Any guidance on this would be great, especiallt considering I can still cancel.
I mainly use my computer for Audio and Video production.
Cheers,
Lee

Thanks for your replies!
I'll mainly be using Apple apps ( Final Cut, Garageband etc ) so it looks like it will be fine.
Does anyone know of a place where I can compare benchmarks of the two computers I mentioned above ?
My iMac is due to ship today... but I think it's coming from Shanghai ( it seems that's where the 24 inchers are being born )... so that could well mean nit will be the back end of next week before I receive it. I get sooo impatient! lol
Lee

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