Hi! I'll chime in on that parts list you posted as I noticed a couple of things that could change.
CPU: take a double look into the benchmarks of the Ryzen 5 series vs. the 3's. A 3700x has close to the same price and could bench quite a bit higher.
You're dead on with the Motherboard and RAM.
GPU: I know it gets tricky here, but see if you can find something with multiple fans. The 1650 should get you by, but I'd be wary of heat issues with that specific model since it looks like its built for mini ATX towers. The solo fan configurations are usually to save space for those types of builds.
Power supply: 850w is definitely overkill for this rig, and overkill does nothing other than run up your electric bill. You can probably save $50 or so by going to a lower wattage unit, or put that $140 budget into a more efficient or reliable psu with a lower wattage. My guess is you would need like a 650w, but the better way to approximate things is to build this rig up in https://pcpartpicker.com/
and see what the recommended power requirements are. Also that site is EXTREMELY useful for price comparing and cross shopping different retailers. It's your #1 resource for this tbh.
SSD: The Samsung evo series are great, if you want to save some easy cash you could go down to the 970evo and you won't notice a difference. You could also consider going to the 860 series (they're not M.2 form) and save even more with a negligible performance hit. I would also look into the future here a bit, because if you're video editing 1TB is definitely not enough space for everything. If the budget allows get an 7200rpm HDD you can use as a storage drive, or just add it in a few months down the line.
As others have said, I'd really recommend building it yourself. The hardest part of that whole process is picking components which you are already doing. If you can read instruction manuals, and google/youtube questions along the way it's seriously a breeze. The most likely thing you're going to fuck up is forgetting to plug something in, and I would bargain that random dude at Newegg is more prone to doing that because of negligence lol. The only real "tricky" part is installing the cpu cooler, everything else is Lego's.