How do you guys feel about refurbished Mac Book Pros. essentially they are pretty much new machines just at a lower price? Are they eligible for warranty? what else should i know? Also the computer would be for my dad. he uses it for alot of boring stuff like excel. I have MS office for mac and he also would be using a program called SAS via bootcamp. What would your recomendation on specs be? Even if it means we have to purchase new.