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).
bwyoung
The GMA Europas would be a good choice in the $600/pr. price range. Also the Opera Audio Consonance Eric-1s can be had for $500/pr. or less (if you can find any for sale), and are super-strong performers in the catagory.

---Dave
Second the NHTs recommended by Rich. They work well on a shelf and are hard to beat for the price.