What Bookshelf / Stand Mounted Speakers To Pair With Vintage Electronics?

Hi all, I recently purchased a 1970's Yamaha CA-810 Integrated and am wishing to replace my current speakers in this secondary system. I use this system for background music while working on hobbies but as you all understand, I want the best possible sound.  Can you guys give me  few choices to consider?  I have thought of Wharfedale, Epos, Monitor Audio, etc. I would look for used or check out Music Direct due to their return policy. My current speakers are old Yamaha bookshelf monitors. I listen to hard classic rock, blues, old school jazz, oldies, Beatles and Elton John. I like a non fatiguing sound.  Would like to stay under 800 bucks for the pair.  Thanks in advance.