Ah, whoops -
I'd probably just end up going with the largest (but quietest) AIO I can fit. I'm not running a K chip, though, so not concerned with OC temps. Still, 8700 non-K under a Noctua NH-L12S had a couple cores hit 100C under load, averaging low 90s. Would like to bring that down.
Is there room on the top mount for two HDD brackets with the SFX-L PSU?
Edit - or did you mean, one HDD brack on top and one on front, with a radiator?
Yes to room on top for 2x HDD kits with 4x total 3.5" HDD with the SFX-L PSU.
You will need a radiator for this setup though as there will be no room for air cooler.
240mm AIO in the bottom pulling air in front bottom should do you fine on a 8700, get you down to the mid-80s.