You do want the City Navigator maps, whether it's part of the bundle you purchase, or via a separate purchase. See prior chain (several posts below) about the various merits of different GPS units. The 800 lacks beaming of routes between units, so you won't be able to get a last-minute route from anyone in the parking lot.
I just purchased the bundle. It comes with everything. I also upload the route before I get to the ride. Now that i am figuring it out, i really really like it.