I've got a Garmin GPSMAP 76CS and I have to say the unit is great. I picked the 76 over the 60 because it floats and that is important for trips down the Rio Grande etc.

The software package does differentiate between known public and private roads but only in line width on the screen. The differences are very subtle on a mono screen, so, for my money the color screen is the way to go. The V has been around for a number of years and is a bullet proof unit, but it isn't color. I would vote for ANY color unit over any mono unit.

The 76 had the largest available memory when I got mine last year and I have loaded all the base maps for Texas, part of New Mexico and Oklahoma on it with room still left. This is important if you don't want to carry a laptop.

If you save all of your tracks like I do, the 76 will hold 20 tracks which is nice.

Hard wire it into your charging system and you will never need to worry, but the 60 and 72 both have significantly longer battery life than the V. At some point you will want to get off the bike and wander around on foot, start goecaching, benchmark hunting, whatever.

I used a ram mount for my GPS on my bike and love it. As big as it seems when looking at it, it is not in the way when I ride.

So ... my vote would be the 76CS