You can't really get cheaper for the same performance since with new parts, since you're already looking at the lowest xx50 tier of gaming GPUs where you're forced to accept unfortunately low price-to-performance ratios. That is to say, they don't make em any cheaper, lol.
If you fix the price to stay the same, a 5600x and a 9060xt 16gb will cost you around the base model's MSRP and will give you ~60-120% more performance depending on game and performance. I imagine the 120% is when the 8gb VRAM on the steam machine runs out at 4k, lol.
