Have you read the Recommended Components lists published by Stereophile & The Absolute Sound? Lots of ideas there, all vetted by people who compare such gear all the time.
Another source is anything that Michael Fremer has published, such as his TrackingAngle & older AnalogPlanet reviews & YouTube videos. Mikey has never let me down.
And re: buying used gear, lists from past years are available on those magazines’ Web sites.