Good morning. I assume the last one is a Nikon. The A6000 and Nikon are no longer made. All of the indicators are that Canon will abandon the M series this year as they expand the R mirrorless system. Used is fine but I would only go mirrorless as Nikon is leaving DSLR as is Canon within 2 years. Leaving only 1 or 2 Pro cameras for now. Canon had stopped production of about 40% of their DSLR lenses already and Nikon's not far behind. Sony and Olympus have been only mirrorless for over 10 years.
The best value within your budget would be the Olympus E-M10 Mark 4. It has built in 5 axis image stabilization with any lens on the camera. No camera from Canon, Nikon or Sony have that within your budget.
The E-M 10 Mark 4 with the 14-42 (28-84mm in 35mm terms) and a 40-150 (80-300mm nice telephoto in 35mm terms) thru 12/31/22 would be $829.98 for anyone. Members here would get a free case and get it for $799.99. If you wanted the Olympus 75-300mm, Super Telephoto. like having a 150-600mm in 35mm terms. The basic kit and this lens, would be $1149.98 to anyone, members here would pay $1089.99 with a free case.
Nothing touches this kit.
Closest to the first kit would be the Nikon Z30 with a 16-50 (28-75mm in 35mm terms) and a 50-250mm (75-375mm in 35mm terms). Thru 12/31 it's normally $1046.95. Call me for the Rokslide promotion as we are not allowed by Nikon to put it in print
I am here all day, every day thru Saturday