Build Advice New build advice

Nov 27, 2019
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Hello all , I decided to get a new pc for nearly 1000$ and so far I chose these parts
CPU: Ryzen 3600
Mobo: MSI Pro carbon B450
Ram: 2*8 GB 3600
VGA GPU: RX 5700

Parts I will use from my old PC are :
Samsung 850 EVO SSD ,
case:corsair carbide 400R ,
PSU:XFX PRO 550 W

My questions or doubts are:

1)should I get RX 5700 OC GIGABYTE or MSI 5700 XT Mech which is about same price where I live? and I can't find any 5700 XT except the MSI and ASUS

2)I can't find any RAM here 3600 CL16 ,SO I have 2 options either 3200 CL 16 OR 3600 CL18 so which option should I get?

and please feel free to tell me your opinion about this built.