I like reading classics for the language itself and for the historical background. I believe, classic books are much more useful than lots of grammar books and course books, though after you've read them all - LOL

Actually I'd never compare grammar and reading as they have different teaching influence. So, to read books one should be acquainted with at least elementary grammar and some amount of words. Anyway, reading good books develops language taste. Thus, grammar and reading practice should go together.
Besides, there's also reading for pleasure.

As for J. Austen, I'd say, her books are highly popular and there are lot's of screened versions. Though, I greatly doubt if a young lad would find her books enjoyable. Personally I love her books and the films.