I'm into modern art, and for a small private museum, they have a great collection. Someone has a great eye for abstract art. Check out the monumental Robert Rauchenberg collage painting. They also have a couple small but interesting Warhol prints, along with a few great sculptures by artists that you wouldn't necessarily know if you weren't in the art world, but that are quite good.
The only gripe I have is that they're limited to American art, and much of the best abstract art came out of Europe after the War. Full disclosure: I am a member of the museum.