I'm happy with the n800 and a usb keyboard at home

but

I would buy a n900 with :

770 form factor with hard cover
2 full size sdhc or al least 2 microSDHC slots
1 regular usb female connector for USBdrive and external USB keyboards
a bit faster CPU and a bit more RAm than the n8x0 for better Flash experience
GPS and Blutooth (but I don't use any of them right now)
WiFi
gamepad style hardware buttons layout

no slide out keyboard with "soon-to-die" flexible cable.

a fully open kernel and drivers to leave us the choice of windows manager instead of Hildonized crap.