Obviously I'm no expert and I haven't been through the grad admissions process before, but I've heard it is harder for international students to get it in general than domestic students. Scripps, MIT, Princeton and UI in particular are considered to be very good programs, and therefore are hard to get into. For example, on Princeton's website they say most people that they admit have GPAs >3.5, a math score>700, verbal>600 and writing 4.5 or greater. I know that some of the other top programs (harvard, stanford, berkeley) have averages of about 780 (~88%) for math, 640 (~90%) for verbal, greater than 4.5 for writing and average GPAs of 3.75 or greater for accepted students, so if Scripps, MIT and Princeton are similar to these then your stats might hurt you a bit but they're not too far off. However, the good news is that I've also heard that your letters and you personal statement are the most important factors, so it's hard to say what your chances are without knowing how your letters or personal statement will be perceived.
Hope that helps!