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I have this machine, can recommend, just make sure you put 3000 mhz ramI think your cheapest option would be to go with Ryzen (AMD) with Radeon Vega graphics.
I've been looking for the same for a long time and needless to say, it isn't cheap.
The thing that would struggle the most is WiiU (Cemu) pero any other would run perfect. Also you might note that Cemu is advancing rapidly so if your goal is only emulating, I recommend it to stick with it.
Recommended: AMD Ryzen 3 2200g 8GB RAM DDR4