If you are buying right now and only play one game, you could check how many threads that game actually uses. If it's not heavily multithreaded then buying a speed binned 9600k would give good performance. However if it was me I would wait 6 months see what Intel and AMD does next.
Probably you would need a bigger budget for the rockstar cowboy game if you want to play it with good settings and resolution. With that budget you can play it on a console.
Well I kind of see what your saying, but it's just for me the term power user and 3400G just don't sit well together in 2019. Power user and high performance desktop to me say moar cores!
Overkill is fun!
Also a 1050ti is required for streaming Netflix in 4k
PCPartPicker Part List
CPU: AMD Ryzen 7 3700X 3.6 GHz 8-Core Processor ($326.81 @ Amazon)
CPU Cooler: be quiet! Dark Rock Slim CPU Cooler ($64.98 @ Amazon)
Motherboard: Asus TUF GAMING X570-PLUS (WI-FI) ATX AM4 Motherboard ($199.79 @ SuperBiiz)
Memory: G.Skill Ripjaws V 16 GB (2 x 8 GB)...