I agree that 6-8 is the ideal size table for socializing. DH always goes to dinner a tad early and deliberately changes where he is sitting so that we have to mix it up. Sometimes I'm right behind him, but usually I just refuse to rush to anything on board.
We will sometimes select a table in the same server's section but aren't too picky. The table size will change each night depending on who we end up dining with. If our dining companions have a favorite waiter, we will usually defer and let them choose the location.