CPU: Ryzen 5 3600 ($190)
Motherboard: MSi B450 Tomahawk MAX ($115)
RAM: Least expensive kit of Micron Rev.E you can find (usually $60-$75 for 2x8GB); set to 3600MHz and use the timings from the Ryzen DRAM calculator on the safe profile
Heatsink: Scythe Fuma 2 ($60)
SSD: Cheapest Phison E12 + Toshiba BiCS TLC drive you can find ($100-$120: current QLC drives are all awful and even as slow as HDDs in some scenarios)
GPU: Whatever RX 5700 you can get that has a decent aftermarket heatsink ($310 for the MSI Evoke RX 5700 right now)
Case: Phanteks P400A ($70-$75)
PSU: Any good 450W+ unit ($40-90 depending on if you go for Bronze or Gold)
Fans: Same. Use them as front intake. ($14 x 2)
~$1020 total (depends on sales)
CPU you can get a Ryzen 7 2700 instead ($150) or a Ryzen 5 1600 AF (12nm version of the Ryzen 5 1600 AE; it's effectively a Ryzen 5 2600 for $85). What you choose depends on how strapped for cash you are (in which case get the Ryzen 5 1600 AF), how much you benefit from having more cores/threads (Ryzen 7 2700), or how much you benefit from better single-core IPC (Ryzen 5 3600).
CPU heatsink I swapped to the Scythe Fuma 2. The H60 isn't particularly good and as with all CLCs they're an additional point of failure due to having a pump.
RAM I swapped to some Micron Rev.E which you'll try to overclock to 3600-3800MHz (depends on how lucky you are with your CPU's IMC; 3600 basically all Zen 2 desktop chips can hit while staying in 1:1 MCLK:FCLK. 3733 and 3800 require some luck). Get the Ryzen DRAM Calculator and copy paste the settings that gives you at a given memory frequency. It's very quick to do; basically no additional tuning required on your part.
For SSDs, the Phison E12 + Toshiba BiCS TLC drives are the best performers for the price. They'll hit 80-90% of the performance of the expensive drives like the WD Black SN750 or Samsung 970 EVO for 50-70% of the price. The other Silicon Motion SM2262EN drives like the HP EX920/950 don't do as well when they're full. Some benches from Anandtech:
The Team MP34, Corsair Force MP510, and Silicon Power P34A80 are the clones that Anandtech has tested. The full list is in the SSD subforum.
GPU swapped to the RX 5700. It's a better performer than the 2060 in games on average. I'd only get the 2060 if you use a lot of CUDA accelerated programs like some CAD software or some ML software which doesn't have ROCm support like Tensorflow. The meager amount of RT cores on it doesn't make it useful for anything.
Case is a bit personal but I just swapped it to the P400A due to it having far better airflow than the H510.