Help with gpu.

No way to tell.
What are your other specs and what will this be used for?

Presumably, this is for gaming.
For graphics cards, you will get fair value at every price point; it is a competitive market.

Past that for a gamer, budget 2x the cost of your processor for the graphics card.
 
RTX2060 should be ok.
But, with your processor, you could go stronger.

And... Is there a typo?
MSI Z370 is an intel motherboard, incompatible with ryzen.

List all of your parts. Better to check all for compatibility.
 

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