My son got a custom build by a local guy for about your price range. He does video editing. He was happy to get rock solid power supply and custom cooling features. He gets it to be upgrade ready.
I echo this approach. The Indi guys are hungry and willing to help build whatever you ask for. Unlike the corporate tools who insist that they know what is best for you and “Here, buy this CCP crappola off of our shelf.” *
* all AppleCrap — for decades.