I put in a day on a 5020 about 30 years ago. Loudest tractor I ever sat on. Pulled good though.
My favorite was my dad's 930 Case diesel. TractorData lists them at 80 hp or so if I recall. It kept pace on a 5-16 plow with the neighbor's Deutz that was rated at 110. It went on auction back in '95 and I've longed for it ever since.
He had a 3pt 18 foot wide field cultivator on it and it would pull it just about anywhere. One time they were cleaning out an old grove to replant a nice tree line at church. He had duals on it with the cultivator mounted. They hooked up a heavy 1" cable around a monster cottonwood stump. There was a 6 foot loop at the end of the cable where they hooked the clevis. He put it in 2nd gear and gave it a tug. The front wheels came up and it balanced about 12k lbs on the rear axles and spun out. The cable clamps slid up the cable with a shower of sparks like a kid's 4th of July sparkler. Another farmer came up behind with his Farmall 460 and started to push with his bucket and the stump moved. They had to get wrenches to unbolt the clamps in order to get the clevis back off though. There are lots of bigger tractors, but I loved the sound of that 6 cylinder snort, and it punched way above it's class.