New build - Please help

[proxyc]

Hi all.
I'm currently putting together a new build but I came across a question, what RAM should I add to the following setup:
- MSI b450 Tomahawk max
- AMD Ryzen 5 3600
- RAM ? (2x8GB)

Was thinking about 3600mhz, but seems to be something difficult to get within my budget range £100.

Can someone help here?

 

[proxyc]

@Space Monkey what's better within my budget to work with b450 motherboard?
- CL 16 @ 3200
- CL 18 @ 3600

I think the latency works out about ~10ns for both but I'm not sure about which one to buy