Its not diameter that makes a wheel look hard or not, its width and offset.

And thats why most cossies look pony.

You ever wondered why Cossies look good on EscCos rims even tho they boring old softline 5spokes?
Cause they wider and lower offset than most rims people go for.

For me, EscCos rims if you on a budget, if not 8x18 front MOs and 9x18 rear ones. Dunno offsets, but get an arch flaring tool and bend the lips back etc so you can run as low as you can, as rims miles inside the arches is what makes wheels look wank, and exactly (well, the ONLY) reason EscCos rims magically look badass.

Not saying anything on the performance front, but looks, well, thats your answer.