Ok thanks.
I'll no doubt be scouring the forums and recommendation threads to see the most commonly recommended items before purchasing so I'll see what works and what is a bit iffy then.
Well if you are buying a Ryzen 3000 series CPU you'll probably want to see what works best with them as it could end up seeing significant IMC improvements. I am not 100% sure but I think they were aiming for 3200MHz support out of the box, much like Zen+ has 2933MHz now. I had some Crucial (Micron) RAM recently that was sold as 266MHz and on the MSI B450 Tomahawk with a 2600X it was hitting 3466MHz C14 and 3600MHz C15/16 and that was super cheap, pushing 1.425v at the highest speed.