The G4 are too slow for a lot nowadays. I would get the Intel model, not just for the great speed bump but as you have seen besides software limitations, most is Intel only anymore, internet has it's hiccups now on PPC. G5 can go to Leopard. The late 2006 models were the Core 2 Duo and can run Lion, the first two 2006 Core Duo models are stuck on Snow Leopard.
I ran Tech Tool Pro 6 on both the Intel and G5 iMac. The hard drives were the same size.
It was amazing to note that the G5 took close to twice the time to finish the same entire test (hard drive test taking the longest).
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