There are several complete editions on Amazon of Austen's novels, so I thought I would write a review recommending this one (the Penguin Classics Deluxe Edition). It lays open in your hand, has nice paper and high-quality paperback binding and cover, and it has perfectly sized type and wide inside margins. Other than the substantial size and weight (though it is not nearly as inconvenient as quarto-sized complete editions, such as the classic Sherlock Holmes), it is a perfect volume for those who are more interested in reading Austen than admiring how she looks on the shelf.
By contrast, the Modern Library hardcover edition (which I compared in person at the bookstore) has such a narrow inside margin that the reader must strain to read bent text or to force the binding to open more and the paper to lay flatter. Otherwise, it was a nice edition. For me, they ruined it by this simple mistake.
The leather bound edition from the Library of Literary Classics is a nice idea, and I have not seen it in person. I did notice, however, that the table of contents shows how little space they manage to squeeze Austen's novels into. It has far fewer pages than the Penquin Classics Deluxe Edition. When previewing the pages of text, this seems apparent in the very small type. As I said, I have not seen it in person, so I may be wrong, but it looks like it might be a strain to read, whereas the Penguin is quite comfortable. Hopefully Penguin will provide preview images soon so potential buyers can "Look Inside" and compare for themselves.
It is wonderful that there are so many editions of Austen to choose from. The choice is personal and subjective. I will spend many, many hours reading mine, so I chose the one that I thought would be the most comfortable. I do not want to fight the book -- I want it to disappear so that my imagination may wander unhindered with Jane's characters. I hope you enjoy the novels, whichever edition you choose.