What to buy? Hi I'm just looking for some advice on what model of the imac to buy? I currently have an G4 which I bought in 2001 and it's now time for an upgrade. I want to use it for Adobe Illustrator, Photoshop and Flash and just wondering if the entry level iMac would be capable of coping with these programs? It's awhile since I have purchased a Mac so I'm a little bit out of touch with whats what so would be grateful of any advice.