Unless you're doing intensive things, the difference in drive speeds isn't going to be that noticeable in typical use. I do notice a bit of difference between the raid setup I had and the new drive now doing certain things (noticeable thing was displaying multiple photo thumbnails), but by no means was the raid setup slow. I just had uses for those drives or I would have left it alone. An m.2 is faster, on paper especially, if you don't mind the price difference. But if you see a deal you like that isn't one, I'm sure you'd be satisfied.

I like the ram I got. Ryzen seems pickier, but I was going to try the same ram I got if I had gotten that. I see that Patriot Viper 2666 is on sale a few places now. 20% off your first order here though, plus tax. https://express.google.com/product/10506699406431752183_8087245093249027839_6136318 From Fry's (reputable store) but fulfilled by Google basically. Free returns if there's an issue.

I can't say 100% that it will work with your Mobo (again, Ryzen is picky) because I didn't research, but on Amazon their bought together suggestions show it with Ryzen chips. Unless you plan on overclocking, it's fast enough.