At whatever price point will get you a fork that has adjustable rebound damping. It doesn't have to be sophisticated circuitry, it just has to work. Rebound damping is the first 'building-block' key to what makes suspension actually work. Most entry-level forks don't have this but I can't tell you any more at what point you'll find it. Been a long while since I've seriously shopped that end of the spectrum.
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Originally Posted by Mark Twain
"Don't argue with stupid people; they will drag you down to their level and then beat you with experience."