Private universities with similar vibe to UPitt and UMass Amherst? [mechanical engineering, northeast or mid Atlantic]

RPI wasnt great with the net price calculator since they dont meet full need. It was similar to U of Delaware and UVM in price

Private full need schools seem to be the best option. Union, U of R and Lafayette are good targets so I am hoping one of them has the laid back, vibrant community that he seems to like about Pitt and Amherst.

I would love it if he landed at BU like his sister (as would she)