Dartmouth is an excellent school and has a wonderful commitment to undergraduate teaching. Here are some of the things I think you would enjoy about Princeton
1. Amazing teachers, top departments in numerous fields, huge emphasis on undergraduate teaching
2. Close knit low-key intelligent happy student body where most kids remain on campus for 4 years. A little different than Dartmouth because of the D plan, which, while great for internships, also means that sometimes you don't see your friends for 6 months at a time.
3. Intelligent administration which is focusing on the arts (a news arts neighborhood is in the works) and new science buildings and programs, while not neglecting other areas. The administration has been in the forefront of proposing innovative programs, such as the Bridge Year, a paid for gap year.
4. Beautiful campus, nice suburban location, reasonably close to NYC and Philly (and with easy on campus access to trains)
5. I see that you are interested in journalism. Princeton offers amazing professors and courses in that field. Here's a link to the guest journalism professors on campus Professors of Journalism - Faculty - Princeton University Council of the Humanities
and the fall 2010 courses include ones taught by Newsweek's Editor-at-Large and NYT and Sports Illustrated senior writers (here's the link Princeton University Council of the Humanities
6. Overall, just a great school and a wonderful undergraduate experience.
Good luck with your choice.