Some Advice

[FocusMK3]

Hey guys! New here, sorry my first post is a stupid question lol

But I just purchased my first set of wheels and need some advice on tires.
The wheels I got are 18x8.5's
Was thinking a 205/40 or 215/40.
I'm looking for some stretch, nothing too much yet. Was looking on tyre stretch but really can't decide.
Anyone happen to be running a similar wheel/tire combo?

[Oh Damn, it's Sam]

I have 205/40 Neo Gens (which run narrow) on 18x8.5. The stretch is mild by current standards, but it's enough that I can place the fender right on the wheel lip: