The Colorado is newer, but I am not prepared to say it is better. In fact, it's more accurate to say the Colorado is a mix of their automotive units, the Nuvi, with the 60/76. There's been a zillion threads about the Colorado over on the Geocaching forums. Here's the main link:

About the Garmin Colorado

Some of the big disappointments to me are:

- Long bootup time of 36 seconds (that's just to boot, not to acquire satelites!!)
- Lots of bugs and problems (buglist)
- Poor screen visibility complaints compared to 60Cx
- Colorado does not float; 76 does
- Better dust/water sealing around controls reported by owners on the 60/76 than Colorado
- Longer battery life rated by Garmin on 60/76 than Colorado
- Colorado costs more

Granted, if Garmin can fix the long list of bugs and improve the screen visibility on the Colorado, then it should be worth the extra money, but to me, I would have a hard time justifying upgrading to the Colorado versus a 60/76 Cx or CSx.