https://petapixel.com/2022/01/19/best-used-digital-cameras-to-buy/The Best Used DSLR Cameras
Ultra-Budget (under $500): Nikon D700
Budget ($500-$1,000): Nikon D800/D800E or Nikon D810
Mid-Range ($1,000-$1,500): Canon 5D Mark IV or Canon 5DS/5DSR
High-End ($1,500+): Nikon D850
Best Used Mirrorless Cameras
Ultra-Budget (under $500): Olympus OM-D E-M1 or Olympus E-M5 Mark II
Budget ($500-$1,000): Fujifilm X-T3 or Fujifilm X-S10
Mid-Range ($1,000-$1,500): Nikon Z6 or Nikon Z7
High-End ($1,500+): Sony Alpha 7R III/Sony Alpha 7R IIIA
Best Used Compact/Fixed Lens Cameras
Ultra-Budget (under $500): Sony RX100 III/RX100 IV
Budget ($500-$1,000): Ricoh GR III/GR IIIx
Mid-Range ($1,000-$1,500): Fujifilm X100V
High-End ($1,500+): Leica Q (Typ 116), Leica Q2, or Leica Q2 Monochrom