so i'm looking into buying a new laptop, and i can't decide what the best for my money will be. i'm typically more than a casual computer user (my page ratio is 3.25:1 right now), and i can't decide which features are really going to benefit me. i understand i'm going to make upgrades after i get a system (just purchased RAM upgrades for my iMac that i'm waiting for), but which startup would be the best. i'm trying to be somewhat economical, but don't wanna get something that will be outdated in 6mo- i've done that too often. any buying advice would help! currently considering MacBook 13.3, 2.13GHz, 2GB RAM, 160GB Serial ATA ($949) MacBook 13.3, 2.4GHz, 2GB RAM, 250GB Serial ATA ($999 refurb) MacBook Pro 13.3, 2.26GHz, 2GB RAM, 160 Serial ATA ($1099) MacBook Pro 13.3, 2.53GHz, 4GB RAM, 250 Serial ATA ($1399) best value? will i notice processor speed differences that are so small?