wireless no longer working? Do you use some special type of authentication?
So unless you are 100% satisfied with 770 go for N800 (or N810 if you don't mind the money and only one memory slot like with 770).
When I got N800 I still used 770 quite a lot and took it everywhere because of the cover and size. Now when I have N810 too I switched 770 for N810. N800 have no good cover and is a bit bulky so I'm using it only at home for couch/bed/toilet browsing and watching movies (full size SDHC slots!).