Since the Custom Topo maps are transparent, you can see other maps beneath it. I've got an old copy of roads and rec, and heres a sample of what it looks like on the G76CSx.
Is there a source for updated road data that could be imported?
Maybe you could even import the garmin data?
I have the same model as you and the topos, with hydro, look great even with the base map that came with it. I guess that when learning how to do the transparent maps I failed to notice if roads were available. I've lived here for 25 years and my friend's "streets" CD fails to show a 23 year old 4-lane highway that runs right by my house. So if I could make my own map including topo, water and roads selectivly for the areas that I want I wouldn't be held captive by outdated software.
Have some friends at the Hgwy Dept that might know of a web site where data could be Dn loaded like the topo/hydro that might be added to the equasion. Wouldn't that be cool?