i am planning to buy a REFURBISHED macbook for use as an architect/industrial designer to save a little money. right now a refurbished base (2.4GHZ) 15" i5 is for sale at $1529... does anyone have any idea how long it will be before that price comes down? how much lower do you think it will go? am i right in going for the 2.4 i5 over the 2.66 core 2 duo? thanks for your help!