I'd recommend starting with just a search on Sweetwater, type in "nylon guitars" and then switch the search list order to "highest to lowest price". That way you won't have to wade through tons of string sets to start seeing guitars. The first few you see will be crazy high prices, but after a page or so, they drop down to the realm of reality. You're right, most of the nylon string guitars have a pretty wide nut width, but there are some, like this Fender that have a narrower nut width. Once you get an idea of what's available, you'll really want to try one out first to see if you like the neck width. I know what you mean.... classical guitars can be quite a stretch for some chords!