Go for non-x 3600 CPU and up the powersupply to a 600W from the money saved there.
If you add Dan A4 you will be above your limit a bit.
Locally the 3600x is cheaper for me so thats why I chose it.
Here is my new list. I only need the case now
PCPartPicker Part List:
https://pcpartpicker.com/list/Xd4hx6
CPU: AMD Ryzen 5 3600X 3.8 GHz 6-Core Processor ($212.96)
Motherboard: Asus ROG Strix B450-I Gaming Mini ITX AM4 Motherboard ($140.24)
Memory: G.Skill Ripjaws V 16 GB (2 x 8 GB) DDR4-3600 Memory ($88.27)
Storage: Crucial P1 1 TB M.2-2280 NVME Solid State Drive ($122.00)
Storage: Seagate BarraCuda Pro Compute 1 TB 2.5" 7200RPM Internal Hard Drive ($67.52)
Video Card: EVGA GeForce RTX 2070 SUPER 8 GB BLACK GAMING Video Card ($524.60)
Power Supply: Corsair SF 600 W 80+ Gold Certified Fully Modular SFX Power Supply ($103.88)
Total: $1259.47
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-04-29 13:00 EDT-0400