I know these questions have been asked over and over. I just picked up the 8gb 256gb but I am second guessing it. The genius was convinced it was all I need. I am teacher that has lots of apps running at the same time. Plus I frequently use lightroom and imovie... Will I be happy with this 8gb or should I get the 16gb with the smaller drive. $2k is my absolute max I can spend so these are my two options and i don't want the 15"... I know I will want the space and an external hd will be annoying but I want my mbp to be a workhorse... decisions decisions.... what do you think?