If it's just for hobby/interest work, then just a heads-up that even the 1st generation Apple Silicon will turn over about one image a second with SDXL Turbo. The M3s of course are quite a bit faster.

The performance gains in recent models and PyTorch are currently outpacing hardware advances by a significant margin, and there are still large amounts of low-hanging fruit in this regard.

If you want an absolute beast, especially for this stuff, you probably want Intel + Nvidia. Apple Silicon is a beast in power efficiency but a top of the line M3 does not come close to the top of the line Intel + Nvidia combo.