I just picked up my first rMBP. I got the mid-tier 13" version. I'm playing with the different resolution options and can't really decide on what to use. I'm currently using scaled 1440x900. I've tried the 1680x1050 but that seems to be a large jump down in size. This one seems very big and the "Best" seems absurdly big. What do most people use? Also will I really notice any performance issues using one of the scaled sizes? What makes Apple say that "Best" is the best setting to use? Thanks.