I'm really interested in a macbook for school as I have a knee issue and need as light as possible. What I'm very interested in is the experience that others have had with the various monitors and resolutions with their macbook. I see Apple is capping the resolution of the external at just under 4K@ 30hz with both screens on. I'm looking for at least 60hz and would typically only be running the external screen by itself. I'm coming from a late 2011 MBP so my current resolution is 1280x800 to put it in perspective. I'm looking to hear whats been used successfully set up wise that others are happy with. I see a IPS WQHD 2560 x 1440 Display on amazon that would double as a dock that I think would be good, but I don't want to run this thing like a dog just by using an external monitor. The next thing I would consider is a MBA which would be a step up GPU wise, but a down grade screen wise. I read a lot of text so I was trying to go up in resolution.