Dual G4s.
The G5 never realized its full potential after Apple suspended development of 64-bit PPC computing to shift to Intel. Much of the newfangled motherboard stuff can also be found in the G4 MDD, the one that can't boot in OS9.

But you'll need to live without PCI-E, a fancy case (instead of the pillow pack case since the Blue and White G3).

Oh, and that liquid cooling thing on the G5 can become nasty with age.

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Living without PCI-e is not relevant to the posters original question as the early G5s didn't have PCI-e anyway so it's not exactly and issue. IIRC the G5s prior to the 'Dual Core' and 'Quad Core' series used AGP 8x graphics and PCI-X (not PCI-e which it totally different, and much faster) slots. In fact the earliest non-top-spec model G5s had normal PCI 64bit slots - not even PCI-X. Living without PCI-X is no hardship really as it won't help graphics speed, and it hates most conventional PCI cards (Mac or otherwise) anyway, despite being 'compatible'.

Also Liquid cooling was only used on the Dual 2.5 and 2.7 CPU PCI-X odels and 'Quad Core' models. Again these are not in the range of machines the poster was looking at.

I also have to argue that the G4 case is every bit as fancy as the G5 one, it just looks different

Ok, here is a pic, look at the very bottom. They are using photoshop CS ( version 8 )

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In that case you are indeed correct. CS and CS2 are PPC only. This is plainly a marketing spin to make the Dual G4 upgrade cards look faster than they actually are [}] ]'>