Like provemewrong pointed out, 2560x1440 is 16:9. I also much prefer 1920x1200 over 1920x1080, but I find it's not so much a preference for 16:10 over 16:9, but rather 1080 simply isn't enough vertical space. I think a 25" 2560x1440 might be pretty nice.
resolution size width x height ppi
2560x1440 25" 21.8" x 12.3" 117
1920x1200 24" 20.4" x 12.7" 94
1920x1080 24" 20.9" x 11.8" 92
16 / 9 = 1.77
2560 / 1140 = 2.25
It's closer to today's CinemaScope: http://en.wikipedia.org/wiki/CinemaScope "today it generally refers to any 2.35:1, 2.39:1, or 2.40:1"