hi, im purchasing a new macbook pro 13 inch 2.53ghz (my first one) ^.^ in two weeks or so. But id like to know some things earlier on to get a head start in not breaking my head later on. if i have the money to upgrade my HD from 250 to 500gigs with apple should i? are there any cons into having a big hd on a laptop? for example if i have 450 gigs of video music and programs installed and only 50gigs left will there be a dramatic decrease in performance? also is it a good idea to keep it stock? (250gigs) if so why? and if i do what external should i get for holding all my video's anime,big bang theory,the office ftw last of all buying the macbook pro comes with a 1 year warranty, can i wait till last week the warranty ends and purchase the bestbuy warranty which allows one time, excuse my french **** up? if i spill soda and return to bestbuy and get a brand new one out the box? thanks for the help just joined two mins ago first topic! excited to be here.