Hi everyone, 1st post here; love you, love your show. I'm going to be buying my first MBA soon and am wondering whether or not I should spend the extra $ to upgrade from 4 to 8GB RAM. I'll primarily be using it for normal computing tasks (web surfing, word processing) as well as watching movies via an external disc drive and occasionally doing medium-level photo and video editing. No gaming, no major video editing. Advice?