The nofan cr-95c is one of very few heatsinks that actually can keep a ~90w cpu at reasonable tempratures without a fan, if this is what you are looking for, considering another case is a serious option.
IF you want to go crazier, you can go a quiet pump and passive radiators for the CPU… with just one 91W part in the look the rad will fit on one side of your case, something like the alphacool cape cora 642. However if your GPU is going to be running factory fans often there is no point, since they will be many times louder, and trying to passively cool both CPU and GPU will require a massive (and expensive) array of fins… although other people have done it by building their PC case as an entire finned desk, or running the water cooling hose to a huge coil under there house).
If aiming for silence remember you hear dBA as linear increase, but its doubling in pressure ever 3, So two 30 dBA fans are only 33dBA, seemingly 10% more when really double, thus in most cases you can reduce fan RPM and multiply the number to maintain airflow while loosing noise.
All in all I think the most pragmatic solution is a Noctua D14 or D15 cooler, on a 91w part it will be extemely low RPM, while not having maintenance, failure points or leak potentual of a water loop. Honestly if you live anywhere thats not the middle of the woods during the days your background noise level will be high enough you can get away with some big slow noctua fans… especially if you set a custom fan curve, remember the hotter it is the more heat you loose on a given heatsink per airflow, so you can shed a large portion of your noise if you stop trying to get the low temps most people expect from aftermarket heastsinks and let the CPU get a bit warmer.
How hot you go is personal choice, but keep in mind the intel stock heatsink doesn’t melt down consumer socket chips at stock settings (although it IS loud), with pretty much all users that don’t touch anything or care about their systems merrly abusing them till their old enough to be spacejunk without failure.
You can probably kill a lot of your noise by ensuring you have a PSU and GPU thats fanless at typical we browsing\video playback type loads (gaming or rendering is harder, and more often than not worthless). Also if you have no mechanical hard drives or hot running M.2 disks that don’t feature a heatsink (and you don’t want to\can’t add one, such as if its on the back of the motherboard), you can basically ditch case fans altogether on an openish case like the mITX prodody, or is you have the denser packed mATX by running one noctua 200mm with LNA in the bottom.
