The PPI is quite a bit higher on the 27 inch. Go check out an iMac and see if you like it. I was very obstinate when I first got my iMac, and swore that I didn't like it. A couple months ago, I checked out a 24 inch at the Apple Store and it was amazing how huge everything felt to me on screen. The extra real estate is nice, but you do have to adjust to it. It is a noticeable difference. In the future it shouldn't matter. Hopefully 10.7 will have resolution independence fully working.