Second the NHTs recommended by Rich. They work well on a shelf and are hard to beat for the price.
Best bookshelf speaker under $700 used
I need your help to advise a friend who wants to replace some vintage speakers that have failed. He likes a variety of music. His system has a variety of sources including vinyl. He prefers an analogue sound. Speakers would be placed in bookshelves not on stands. His electronics are mediocre mid-fi (also quite dated).