Humm, if I'm honest I'd say you'd be looking at a minimum of a 15" Mac for those apps. You don't wanna feel squeezed in with Flash, PS and AI, and it's always good to have a wide screen to edit code.
But if that's out of your price range (£1299 onwards), go for a Mac Mini for £500 and buy a 20" screen (if you dont mind losing the portability side).
Tim
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