You have a great opportunity for an excellent program at Pitt. Full ride means no taking out loans first 4 years and there might be scholarship opportunities for year 5 and 6 also. Tuition for last two years is $30,000 I think so you could potentially leave pharmacy school with less than $80,000 in grad loans with housing figured in.
Northeastern lists almost $15,000 for room, board and books alone. That would be $60,000 for just the first 4 years and then year 5, 6 you would be full pay. Also off campus housing in Boston is most likely much more expensive than in Pittsburgh.