I'm obviously a biased source, but I metaphorically keep the Vorkosigan books [0] in a similar place with the (more-famous) Discworld series by Terry Pratchett. Both are fun reads to return to which I also find very quotable. (Although one is space-opera and the other is satirical-fantasy.)

Interestingly, the first few books are about Miles' parents, but it's neat to see what the most popular character does/doesn't inherit.

[0] https://en.wikipedia.org/wiki/Vorkosigan_Saga