N800 is at least 2 times faster. Maybe even 3.

That said, N770 is not for the gadget graveyard yet. Nokia won't support it anymore though, so the community is on its own (Nokia is not a linux community you see). There will be at least one 2008HE, or at least that is promised.

Canola2 needs only a media scanner to work on the 770 (no inotify in the old kernel). Hell, i can even run it now, but without media scanner it won't be of much use.

Maemo mapper 2.3 is working on HE without any problem.