I am purchasing a new macbook pro and trying to decide if the i5 is worth the extra money. I'm an architecture student and photographer so graphics is important and I'll most likely be running some architecture programs that require some power. At the same time cost is a big factor and I'm looking into buy a refurbished mac and see a lot of core duo macbooks for sale and just want to know if it won't make too big of a difference in the machine compared to the i5 or if a better graphics card is better or what. Thanks for any help.