Hi,
Here's an example well within your budget with room to grow later. AMD based.
Asus AM4 TUF x570 Motherboard
Buy ASUS AM4 TUF Gaming X570-Plus ATX Motherboard with PCIe 4.0, Dual M.2, 12+2 with Dr. MOS Power Stage, HDMI, DP, SATA 6Gb/s, USB 3.2 Gen 2 and Aura Sync RGB Lighting: Motherboards - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
AM4, Ryzen 7 3700x (8c/16t) CPU
Buy AMD Ryzen 7 3700X 8-Core, 16-Thread Unlocked Desktop Processor with Wraith Prism LED Cooler: CPU Processors - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
Noctua NH-D15 CPU Cooler
Buy Noctua NH-D15, Premium CPU Cooler with 2X NF-A15 PWM 140mm Fans (Brown): CPU Cooling Fans - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
....
alt: Cooler Master Hyper 212 RGB Black Edition
.... https://www.amazon.com/Cooler-Master-RR-212S-20PC-R1-Direct-Contact/dp/B07H22TC1N/ref=
G.Skill TridentZ 32Gb DDR4 3200Mhz RAM
Buy G.SKILL TridentZ RGB Series 32GB (4 x 8GB) 288-Pin DDR4 SDRAM DDR4 3200 (PC4 25600) Desktop Memory Model F4-3200C16Q-32GTZR: Memory - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
Samsung EVO 970 1TB SSD (NVMe)
EVGA 750Watt BQ 80+ Bronze, Semi-Modular PSU
Buy EVGA 750 BQ, 80+ Bronze 750W, Semi Modular, 5 Year Warranty, Includes Free Power On Self Tester, Power Supply 110-BQ-0750-V1: Internal Power Supplies - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
ASUS TUF VG289Q 28" IPS 4K Monitor
Amazon.com: ASUS TUF Gaming VG289Q 28” HDR Gaming Monitor 4K (3840 x 2160) IPS FreeSync Eye Care DisplayPort Dual HDMI HDR 10,BLACK: Computers & Accessories
www.amazon.com
(You could splurge and get something a little better, or go ahead and add a second monitor of your choice if you want a dual setup)
Add your
large case of choice (aesthetics are up to you; make sure it's depth can handle a taller 6" CPU cooler by measurements and the GPU length)
Add a 2nd SSD for non-OS/install data holding of your choice (or HDD if you want higher capacity)
Add your O.S. of choice (Win10?) if needed
Add your GPU of choice (the GTX3070?)
Add your networking card of choice (intel based NIC for wired; or 5Ghz wifi NIC for wireless)
Add your choice of an USB DAC/AMP and headphones for quiet gaming; or a setup for desktop monitor speakers (note this separate for more detailed options)
Add your choice of peripherals (keyboard, mouse, etc; this is ergonomic based so its very personal, there's no perfect set for everyone)
+/- room to spare
Very best,