[Agama]

I've been considering a new eReader for some time now and my first choice has been to stick with ePub and Sony. However, I had a hands-on with a Kindle Paperwhite today and was really impressed.

I've built up a collection of ePubs, many of which have been hand-tweaked for styling and structure and I would like to keep all this on my next reader. So my conversion question is quite general: if I convert these to AZW3 using calibre, is the formatting likely to be preserved?

For example:

1) Horizontal and vertical margins on headers and paragraphs, whether in em or pt.
2) Tables including borders.
3) Borders on DIV elements.
4) Multi-level TOC (like ePub's toc.ncx).

Are there any ePub features that cannot be converted?