If i want to buy my macbook pro preinstalled with 500gb hard drive, will they have them ready to buy in the apple store or do they only carry the base specs for each model? I am going to buy a 13 inch 2.53 GHz macbook pro with 4gigs of ram and a 500 gb hard drive. I would like to buy it in store but dont know if they would carry the 500gb upgraded version as well as the 250gb base model or just the 250 gb one. Do i have to buy it online if i want to buy it with upgraded specs? Thanks guys.