reply to Teasip
Re: 27" Apple Display Too Big? My iMac is a 27" and I love it. A week and a half ago, I bought a 13" MBP Retina as a new "work" machine under my employer's new BYOD policy. (the 13" for portability when I travel on business) I'm currently using it with the 22" Dell monitor here in my office that was mated to my older Dell laptop. I'm not overly happy about it...and have decided that when the cards fall right, a 27" T-bolt display will replace the very nice, but inadequate 22" Dell.
That said, what folks already intimated is good...if you tend to only run one thing at a time, then a smaller screen can work well. If, like many of us, you multitask and prefer to be able to see multiple windows and applications concurrently, then the larger screen is a must.