I had to drop in on this - last month, I ordered a batch of 9400's for my company including one for myself (I do love my job). Everyone got the 1920x1200 tru life but me - I used to have a XPS2 with that screen, and I always found it a little hard to read. I figured 1400x900 would be the perfect resolution for me, and I could run games native at the lower rez too and get better framerates.
3 days later I called my business rep and had them switch me out. Maybe it took seeing them side by side, but the 1400x900 screen is noticably lower in quality than the tru life. Not as bright, not as colorful, and it's an odd resolution that quite a few games/monitor apps had issues with. The whole experience was just "funky", I can't describe it any better than that.
Since then I've come to appreciate my higher resolution screen. In Vista, at least, there are a lot of options for increasing text size, icon size, etc over XP (which is pretty basic in that regard) so I've stuck with that.
My suggestion is you stick it out with your 1920x1200 screen and get used to it/fiddle with the settings. You will prefer it over the lower resolution screen, trust me.