Sounds like the $90 price drop in the n810 has been included in the discussion.
Personally, with an n800 and an n810, I am starting to like the n800 more, but it is noticeably less pocketable (I am 6'2" 230lbs, so I have big pockets, but there is still a difference. The n800 bumps my phone, but the n810 doesn't. I wear Jeans mostly).

Speakers are very good on the n800 (considering it is a battery operated thingy that is pretty small). Travelling with my kids, if I turn it up, they can hear it well a few seats back. That isn't an audiophile perspective, just a 'hear the words on a film/audio track'. it works for that.

I don't use a screen protector, and I let my kids use it some. I haven't noticed a problem. Had it for about 5 months.

It is good for looking over FAQS (plug for gamefaqs here), and I do use it for reading other web sites too, but if I can, I use a laptop or a desktop (desktop is even better for the bigger screen).

If you are looking for something that can make you happy in the living room (and with the earphones, the audio is very nice, and even without, up close the quality is there, and from a distance the volume is there) to read web sites and listen to some stuff, it is really good. Watching videos seems to be less positive, since you need to reduce their video bandwidth to enjoy them on the nxxx series (surprisingly since they has such a nice big screen, but apparently not such a nice big data bus leading to the screen).

I have ended up using them as toys, not work items like I expected. They are fun for youtube, websites, flash games, keeping up with my email, doing significant VoIP (my one work related real use), and, redundantly, looking at web stuff in the living room. To pull it out of your pocket and look up who that actor is on IMDB is priceless.

The n800 for much less money and with much more available memory (if you stuff the sd slots) just does much more. Despite my hesitancy over an on screen keyboard, I find that the onscreen keyboard of the n800 makes me happier than the slide out physical keyboard on the n810. And since the GPS on the n810 is almost worthless without the $xxx spent on the navigation software, I am liking the n800 more and more.

Good luck, Hope you find something that makes you happy!