I'd avoid the KBA. They're not good for much of anything, except maybe blocking a field road to stop trespassers. The RWA is nice and a BWA or BWF is better, but they're for late models. RW would be age appropriate to your 60 - nothing wider than 10 feet if you're planning on pulling a harrow behind.
I'd surely pay $500 for a GOOD disk. Make sure it has all the scrapers, no cracked or broken disks, and the bearings or bushings are tight, and the tires hold air. It's far better to pay more for a good one than to drag home a bad one and find out how much it's gonna cost to repair it. frankly, a smaller disk like that with shot bearings and cracked disks is gonna cost waaaaay more than $500 to fix - if you can even find parts.
Many smaller disks and other smaller pieces of equipment has found it's way yo China in the past 5 years. Unprepared scarp just broke 200 again around here. More is gonna go, unfortunately.
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