When Leopard comes out, I plan to get a 20in iMac. I'm trying to decide between the 2.0 GHz or 2.4 GHz. Is there a noticeable difference with the extra 0.4 GHz? Or is the money better spent on extra RAM? I plan to use the iMac with Adobe Photoshop, InDesign, Flash and Dreamweaver amongst the usual Mail, iTunes, Office etc. and tend to have all of them running at the same time. Thanks!