Actually, the 770 has a bug where the mere presence of a 802.11n router kills the ability to scan for wireless networks (irrespective of whether those networks are n, b or g). If it were a question of just not being able to connect to 802.11n access points that would not be a problem for me (my home router is b/g).

It also seems that having too many b/g access points also kills the scanning (I don't know if that has been confirmed, but none of the 31 APs I can see nearby seem to have speeds larger than 54 mbit/s so I'd say they are not 802.11n).

In any case, if I could find out which neighbour has a 802.11n router I don't think I could disable n on it.