If you really are interested, there are all sorts of resources on the web (try "dcrainmaker") that can answer most of those questions. Otherwise, you are asking people to do too much work (work that you should be doing).

The 810 has some issues (maybe, more than it should). Keep in mind that the number of people complaining are a small number of the people who have bought them.

The older 800 seems to be more solid.