hi, i am new to mac...i've used windows for many years, just switched to a mac last week, and will *never* go back to windows. i have a question about cases/laptop bags. i'm looking at purchasing a swiss wenger case, which, according to the website, is supposed to fit most 15.4" notebooks. all i know about mymacbook is that it's a 13.3" screen. so will this swiss case be a good fit or will it be too big? thanks!