When Dave and I met, we discovered that we have a multitude of books in common that we really liked. When we moved in together, we discovered that we didn’t have a lot of overlap in books we actually owned. It was actually kind of surprising, as we both really enjoy Dune, Wheel of Time, Robert Heinlein and Isaac Asimov among others. Now that we only have to buy one copy of the books we like, we’ve added series by Kelley Armstrong, Brent Weeks, Jim Butcher and many others. (We also really like Kim Harrison, but so far, we’ve mostly gotten her stuff from the library.)
Any other recommendations?