Oskrrt

Ryzen 3000 as a whole is insanely difficult to get any OC out of as the chips are already practically at their limits from the factory. It's to the point where they turbo to their highest clock speed, making overclocking almost irrelevant. The stock cooler will work just fine but the CPU won't clock up as high as possibly can according to some reviews (I wouldn't know if it would or wouldn't, I put a Hyper 212 Black Edition on my R5 3600 when I built everything and have been at 70C with the CPU hitting 4.125 GHz all core under full load)

Ryzen 3000 as a whole is insanely difficult to get any OC out of as the chips are already practically at their limits from the factory. It's to the point where they turbo to their highest clock speed, making overclocking almost irrelevant. The stock cooler will work just fine but the CPU won't clock up as high as possibly can according to some reviews (I wouldn't know if it would or wouldn't, I put a Hyper 212 Black Edition on my R5 3600 when I built everything and have been at 70C with the CPU hitting 4.125 GHz all core under full load)

I literally built a PC with parts around that price range, so I'll just recommend what I got. 
Motherboard: MSI B450 Tomahawk. Great VRM's which are waaaaay more than enough for the 3600. Maybe wait a bit for the MAX version of the board with the better BIOS. Also has a "BIOS Flashback" feature which allows you to update the BIOS without needing to have a CPU installed. Great board overall, but the onboard audio leaves a lot to be desired, as it doesn't get very loud and is actually a step down from the original B350 Tomahawk.

RAM: Corsair, G.Skill, or Team Group. 2x8GB 3200 MHz. Lowest CAS Latency possible in your price range. The kit that I got is Vengeance Pro RGB 2x8GB 3200 MHz C16 and works perfectly.
 
Also, as a sidenote, I'd recommend getting a nice tower cooler or some form of upgraded cooling for the CPU as the Wraith Stealth included with the 3600 is good but not great. Something like a BeQuiet Pure Rock Slim, Cryorig H7, or Cooler Master Hyper 212 Black Edition.

I literally built a PC with parts around that price range, so I'll just recommend what I got. 
Motherboard: MSI B450 Tomahawk. Great VRM's which are waaaaay more than enough for the 3600. Maybe wait a bit for the MAX version of the board with the better BIOS. Also has a "BIOS Flashback" feature which allows you to update the BIOS without needing to have a CPU installed. Great board overall, but the onboard audio leaves a lot to be desired, as it doesn't get very loud and is actually a step down from the original B350 Tomahawk.

RAM: Corsair, G.Skill, or Team Group. 2x8GB 3200 MHz. Lowest CAS Latency possible in your price range. The kit that I got is Vengeance Pro RGB 2x8GB 3200 MHz C16 and works perfectly.
 
Also, as a sidenote, I'd recommend getting a nice tower cooler or some form of upgraded cooling for the CPU as the Wraith Stealth included with the 3600 is good but not great. Something like a BeQuiet Pure Rock Slim, Cryorig H7, or Cooler Master Hyper 212 Black Edition.