Hello, I just ordered a new 23 inch full hd monitor to use with my 15 inch rMBP. I think I wont be using the machine in clamshell mode so I will have both screens available as a dual monitor setup. My question is, do you think I should get an external keyboard and mouse or is it fine using the one in the laptop. I know this is a matter of personal preference, I'm just looking for opinions. Let me know your preference and why to see if I should order them.