Best graphics card for mac pro video editing

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It's weird because the rx580looks more expensive than the rx580nitro which confused me but it gives me incentive to get the nitro version. I've been looking at the Sapphire Radeon rx580as the best 'cost-effective' solution to adding a graphics card to my tower without having to spend more than ~$200. Hi there, so I'm building a desktop that is primarily going to be used for video editing in premiere pro and moderate browsing/watching youtube.

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TLDR: 1) what's best graphics card for under $400 for premiere pro? 2) is the Radeon rx580 nitro a plug and play installation?