The Garmin Nuvi 465LMT is a time tested solid unit. But unfortunately its aging. The new generation of GPS units sport all kinds of new features, functionality, and responsiveness. I was an owner of a 465 before switching to a DEZL 760(the brother to the RV 760 GPS). There is really no comparison. I agree with the other postsers, the new RV 760 GPS from garmin is probably the way to go if your not scared off by the cost difference between the 465 and the 760.
This
RV GPS comparison and this forum consistenly reports that both units are best in class. So either way you should be getting the best of the best.