Having asked / read a lot here, I am still confused / not sure on what the best combination will be.

I have decided on:

Asus ROG Crosshair VII (wi-fi) motherboard
Ryzen 7 2700X Gen 2
Dark base Pro 900 Rev 2 case
Corsair RMx 750W PSU OR be quiet! - Straight Power 11 750 W 80+ Gold
Sapphire - Radeon RX 570 8 GB NITRO+ Video Card

I am confused on memory selection, having read various views on type/speed etc.

My broad needs are 8Gb x 2 3000Mhz (mainly for home video editing work). I am tempted to break the bank and go for 32Gb now to future proof. For 32Gb, should it be 2 x 16Gb?

Views and advise will be greatly appreciated.