best speakers on AGON for about $500

Here's the story. My father loves Jazz and Blues. He still owns many old LP's dating back to his single days in the sixties. Back then he had a Sansui Receiver, Sansui record player, and a pair of Acoustic Research AR3's. Since 40 or so years have gone by, he has nothing left except the LP's and no way to listen to them (it's been this way for about 20 years).
A couple of months ago, while listening to my own system, I remembered how much he liked his music. So, I thought, why not put together a budget system for him for a Christmas Present.
So far the only thing I have bought is a B&K Pro10mc Preamplifier. I plan to pair it with something along the lines of a B&K ST-140,ST-202, EX442, etc. It's just a matter of time before I buy one of these amps mentioned.
This post is to try to get some opinions of speakers available here on AGON now, or commonly available for about $500 give or take. Not interested in rare hard to find speakers. Just ones I will have a chance of getting in a timely manner. A few names that come to mind are EPOS, Vienna, Usher, Quad, Paradigm and more. What do you think would pair nicely with these electronics and his old LPs? Keep in mind I'm not interested in rare hard to find speakers. Just ones I will have a chance of getting in a timely manner here on AGON/Ebay. Thanks for the input.