One of my most prized books is REMEMBERING MUSCLE BEACH personally signed by the author Harold Zinkin who was Mr. America 1945.
Another is my signed copy of Cal Bolder's (aka E. C. Craver) novel THE LAST REUNION ( a very, very good mystery thriller by the way!)
In fact any of my books that are signed by the author are among my favorites and most prized as they could not be replaced, in some cases.
Otherwise, the books I enjoy having around the most are the series of WHATEVER BECAME OF.....? books. I discovered them as a kid and bought each one as it was released, up until the series stopped in the mid 1980s or whenever it was.