Yeah. Imo, $15 diff isn't a bank breaker lol
Both choices are fine, just CPU will be comparable to the following generations for longer. 8000 series is the only choice for that chipset. Next series won't use it.
Going from 8400 to 8600k/8700k won't make sense later either.
Jus what I would do :)
Initially had a 7700k with aio and no gpu. Was rough for a couple weeks but saved for a 1080 ti. 10/10 would do again lol
https://pcpartpicker.com/user/penguins0690/saved/ftbkLk