iv had 17inch wheels with a 205 tyre width on a previous starlet. they rubbed and scraped like mad and scraped on the inner arch when i locked the wheels.
iv also had 14 inch wheels for ages and had no problem but they look far too skinny from behind and dont fill out the arches.
i would reccomend 15 inch with 195/50 tyre. its the best happy mediun between size, looks, fitment ect..