Don't be fooled by the marketing. Avoid buying the 12600 as It is NOT a non-k variant of the 12600K. The 12600 is just another 12400, both with just 6 core. Just save the bucks and get 12400.
Also, with your budget, I would pick 12700 as 12400 already struggling in CPU-depending games like cyberpunk. Not to mention your plan for a GPU upgrade in the future.
For PSU, consider Leadex III 750W/850W. For me, 3080, I will pick 850W.
Also, you can get 970 Evo Plus for SSD as it will have better sustained speeds. 980 is when you have no more budget or don't care. Some may argue getting other ODM PCIE4 drives for the same price, but you are sacrificing durability for speed, and in use cases that don't matter, it's irrational.
Don't forget to buy a CPU cooler also