You can start here.

https://www.amazon.com/CyberpowerPC-Xtreme-i9-9900K-GeForce-GXiVR8080A8/dp/B07VFFCQ6L/ref=sr_1_15?keywords=pc&qid=1578365259&sr=8-15&th=1

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If you have enough try and go for the 2080 super instead of the 2070 super

Replace the 9900K for the i7 9700k + 2070 super is $1399

Amazon has this prebuilt for 1.2k. Does that help?