That modern look....

17 inch is about the biggest I'll go to. Tires that size are affordable and there is a huge selection of sizes. I accept 18's but it only depends on the style, I don't like most.

That said I still prefer 15 inch but only by a slight margin over the 17's.
Never been and never will be a fan of 20, 22 and 24 inch rims.

But to each his own.