I would suggest you start here:
Our workstations for DaVinci Resolve are tested and optimized to give you the best performance and reliability. View our hardware recommendations.
www.pugetsystems.com
Our workstations for Blender are tested and optimized to give you the best performance and reliability. View our hardware recommendations.
www.pugetsystems.com
Our workstations for Adobe Premiere Pro are tested and optimized to give you the best performance and reliability. View our hardware recommendations.
www.pugetsystems.com
As you can see, if you use blender extensively - go with Nvidia.
the i7 14700 would be launching in a few weeks. I would suggest you wait for that.
Since the CPU usage would be high and under constant load, i would suggest getting a good mobo with beefy VRMs.
consider 12+ phase and 70A capacitors for VRMs.
DDR4 might still be viable for you. So you can consider a Z690 mobo with USB bios flashback and get the i7 14700 and DDR4 rams.
Welcome to the new era of DDR5 RAM
www.tomshardware.com
BIOS Flashback boards let you update without a 12th Gen CPU on B660, too.
www.tomshardware.com
64 GB of 3600mhz CL18 should be the sweetspot.
Go for high end SSDs. I would suggest Crucial P5 plus, WD SN850X, Kingston KC3000, Samsung 980 pro/990