Hi guys, I actually have a MBA 13" mid-2014. I found it quite good, except for the resolution of the display and the animations (are a bit laggy after I upgraded to Yosemite). Apart from this I found it an excellent machine but... I need more horsepower to handle my daily tasks at work. During the next weeks I'll move to AU for work, and I would like to switch to a rMBP 13 but I would need some advice on which configuration should I get. SSD is ok 128GB, but I don't know which CPU/RAM configuration could suit best for me. My average workday involve 2 browsers opened with 5-7 opened tab each, multiple excel files opened, skype, mail, calendar, html editor, an http sniffer and dropbox. I'm always connected to a 24" HD external monitor... I was wondering if rMBP 13" GPU can handle Yosemite with an external monitor smoothly because I noticed that my MBA sometimes stutters (e.g. when scrolling App Store or Safari). I wouldn't go for the 15" since I move a lot... Thank you for your advices.