The minimum size I would consider. a 285 will also work with no issues at around a et35-40 offset and stock suspension.
The stock PP tires will fit on a 19x10 wheel. I would not bother reusing the woefully small 235mm standard tires (your new winter tires) and they would limit you to a 18x9 ish wheel.
For fitment specifics, once you have a target size, just tell the vendors what car you have (PP or not), and they can tell you what will fit.