The $1699 iMac G5, 64bit, cannot hold $2000 worth of RAM. It comes close but only if you buy your RAM from Apple which is just asking for expense. This applies to all computer sellers.
I'm not sure if this move back to 32bit is a "step backwards" given that the new machines are twice as fast as the G5 equipped ones despite having a lower processor speed. I'm sure 64bit will be delivered by Intel in the future and that Apple will continue to move OS X and it's applications to being fully 64bit capable.
P
I read from one of the tech blogs that the new chips inside the iMac and MacBooks are 32 not 64 bit like the G5. Is this a step backwards or did they realize that no-one is putting $2000 worth of ram into a into a $1600 home PC

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