Anyone have advice on buying a new macbook pro?

I’m a print designer (my main software is InDesign, Illustrator and Photoshop) and I need to get a new laptop. I’m going to get a 15” Macbook Pro. Should I really spend the extra $300 for a 2.66GHz processor (instead of the base 2.53) and a dedicated graphics card, or is the Apple rep just trying to upsell me?

I’m working on a 2007 Macbook Pro now with a 2.2 GHz processor and a dedicated graphics card which works fine for me.