Well, I use an nh d15 for my fx 9590 and it is whisper quiet. Keeps it about 45C under load, that's the highest I got with it so far. (I do question that temperature to be honest, there is apparently a 15-20C difference on most software, so it's probably around 60) The V21 has a cpu cooler height limit of 185mm, so you should be fine using the nh d15. (As long as you can bare the fan colour):
Noctua NH-D15
https://au.pcpartpicker.com/product/4vzv6h/noctua-cpu-cooler-nhd15
If you don't like the looks though, and want a stunning looking air cooler, then these have similar performance to the d15:
Cryorig R1 Ultimate
https://au.pcpartpicker.com/product/xFw323/cryorig-cpu-cooler-crr1a
CoolerMaster MasterAir Maker 8
https://au.pcpartpicker.com/product/7sL7YJ/cooler-master-cpu-cooler-mazt8pn418prr1