Like everyone else I am trying to decide on c2d or i5. I am a photography/interactive media student and will follow a career in photography. I have been using my 20" 2.0ghz imac since march 08. My photography is getting pretty serious and I am spending more and more time editing in photoshop etc. I am also spending huge amounts of time in dreamweaver and flash also some final cut. Since installing snow the imac seems to be running very fast. I could however do with more screen real estate. Would I see a huge gain in performance from 2.0 to 3.06?? how about from 3.06 to i5 2.66? in the tasks I use my mac for?? Also ,as the clock speed for the i5 is lower thank the c2d would it technically be slower when not utilising all 4 cores or would turbo boost make it faster?? Any advice/comments are appreciated. thanks.