Stu - We run many i5 and i7 27" iMacs in our advertising studio, and they are doing wonderfully performing high-end graphics duties. Photoshop, InDesign, PremierPro, SoundBooth - you name it, we run it. These machines are designed for this sort of work from the ground up. Like any machine - spec it with as much RAM as you can afford. Many OSX packages now make heavy use of the GPU too - which is much faster than a CPU for processing graphics.
I buy most of our Macs at JB Hifi, believe it or not. Apple prices are mostly uniform - no matter where you buy from.
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