Haha, don't get a Mac, at least not a G4 like my Mini. It's terribly slow!
I've not done a comparison to see if there's any real difference between my Desktop (Athlon X2 4200) and my laptop (C2D T5250) but they seem to run much the same speed in Photoshop. Though if I had to get a new system right now, I'd probably lean towards Intel. They seem to have the market in general for the fastest mobile and desktop machines.
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Urban De-Development
* Athlon X2 4200 | 2048M RAM | 160G HD | 7600GT
* C2D T5250 | 2048M RAM | 160G HD | Intel x3100
* G4 1.33GHz | 512M RAM | 40G HD | Radeon 9200
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