18 8.5 and 18 9.5 with a 25 offset is very doable on a coupe.
I'd say go 18 9.5, run a little camber and a little stretch / fender work.
Here's a link to Sleepcells Gram light setup which is a 18 9.5 +12 offset. So if you went with your +25 offset you would still have a nice wheel and tire...