You're missing the point. I'm not trying to argue about which system is better, I'm just saying that the comment I'm replying to is saying incorrect things about GPU performance. I'll answer your question anyway though:
You could build a complete desktop system including a GPU that's more powerful than the one in the M1 for ~$1000, but certainly not a 3080. They're very expensive, and nobody has any in stock anyway.
An RX 580 or 1660 would probably be the right GPU with that budget. (Although you could go with something more powerful and skimp out on CPU and ram if you only cared about gaming performance).
You could build a complete desktop system including a GPU that's more powerful than the one in the M1 for ~$1000, but certainly not a 3080. They're very expensive, and nobody has any in stock anyway.
An RX 580 or 1660 would probably be the right GPU with that budget. (Although you could go with something more powerful and skimp out on CPU and ram if you only cared about gaming performance).