For now the RV760 is fine for me the RV660 has a couple new items and a higher res screen. Either has two items I really like/need. One is lane assist, tells you what lanes you need to keep on route. And voice command, if you change or add to you destination you don't need to touch the GPS, just tell it. Of course this never happens, the wife sees newville and says "lets stop and see" you tell the GPS to reroute to newville and it takes you there. I think the next greatest is the 860 8" high res screen, but I'm waiting for the drive on GPS, then you just drive ON the like. LOL
Full disclosure I have a bunch of Garmin's RV 760 being one.
LEN