For 800 euros, you can definitely build a solid streaming PC. I'd recommend going with a Ryzen 5 5600X or an Intel i5-12400F for the CPU, as they offer great performance for both gaming and streaming without breaking the bank. For the GPU, something like a used RTX 3060 or a 6600 XT would give you plenty of power for smooth streams. Make sure you have at least 16GB of RAM and grab an SSD for fast load times. I found that focusing on good cooling and a decent motherboard helps with stability, especially during long streaming sessions.