Why I got the N800: 1-price. Its almost 1 half than the N810
2 I prefer the keyboard apart, because thumb typing tires me out. And a full BT keyboard is a lot more comfortable.
3 I don't need GPS. It is a nice plus, and if I ever decide I want one, I can get one cheap.
4 The SD slots. Been talked to the end in the forums, and double standar SD slots are a whole lot more comfortable.
5 The camera rotates. Dunno, I like it better than the fixed one. But It wouldn't be a deal breaker.
So basicaly, what the N810 has as a plus, I could live without or get around, and get a better price. So, having less money available, the N800 was the way to go.
I would have liked the better screen though.
Hope it helps.
Cheers