I am going to buy the 13 inch MBP with 2.26 GHz for college. Can anyone tell me where to buy reliable, good quality RAM (upgrade to 4GB) and a ~250 GB HD (preferably comparable to the one in the 2.53 Ghz model)? I hope I can save some money. Also, what kind to buy for each. I am familiar with upgrading desktop PCs but have no clue what works with the new MBPs. Thanks.