I feel like RPF1s are only nice looking in wider, low offset fitments. The spokes are straighter and they have a nice lip. Functionally though, they are all awesome for the price.
Random google images...
Good RPF1:
Bad RPF1:
If you hear rubbing, do the mod. I doubt you'll need it with your set up. I have 235/40 on 18x9 wheels, lowered about 1" and I do not have any rubbing yet.
17Z and 18Z are one piece and they mount directly to the knuckle. The ones in the pictures have an adapter bracket, and the shape is very different.
These are 17Z from my old Audi A3.