Aside from the sorts of formatting already mentioned, I've read several (contemporary) novels written entirely in the form of emails back and forth. So there were no chapter divisions, no true breaks at all, just messages flying back and forth. 

So, from a writing perspective, find what suits your novel and work with it. I think with an alternate format, you may find it more work to make it readable...but well worth the effort. 
Calenmirel, I love Jane Austen! 
Pride and Prejudice is my favorite, but the others are enjoyable as well. She does have a distinct style, influenced by the era in which she wrote, but the books are well worth the read. There are some excellent film adaptations too. Have you seen the BBC mini-series version of 
Pride and Prejudice?