I suggest the Salk SoundScape 12s. They are incredible with vinyl. You are not likely to find them used, but since they are internet only, the price is much less than a bricks and mortar place would have them. They sound very natural and have so broad a dispersion that they have a similar tonal balance at any seat in your room The image would suffer, of course, but the tone would be very similar anywhere. Of course, I wouldnt buy this or any other speaker without hearing them first.
Bob
Bob