So do you need just the computer in the case part or do you need everything else like a monitor and keyboard and such?
So here's a start with everything but a case. I don't know what you like for cases and there's a variety of choices. I got it to $650 so that leaves $100 in your budget for a case: https://www.microcenter.com/site/content/custom-pc-builder-amd.aspx?load=c747acba-8bea-46e0-8b7d-5afc72f1d11a
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