I think you have very good chances, you made really good use of your summers.
@krolivan Thanks! Good luck!
Looks like most Dartmouth students join fraternities or sororities. Is that of interest to you?
Dartmouth also uses the quarter system and has the D-plan: http://home.dartmouth.edu/education/undergraduate-experience/flexible-study-plan .
@ivyoxbridge1 I would say you have a very good chance at the top colleges, given your stats and ECs. For Stanford and Harvard, it might be a little better if you have slightly more prestigious awards. I do have one question. For the research you did at Columbia, are you an author of the published paper or are you listed in the acknowledgement?
I would apply to Yale and Princeton instead of Chicago in order to maximize the chances of getting into a very top level school.