Someone also mentioned some of the other Garmins such as the Nuvis. To my knowledge, some do tracks and some do not. The lower end ones are generally in my experiance for the road only. They may do some tracking, or "breakcrumbs", but are limited in how many and how long the tracks can be.
The MyGig was also mentioned. I have no experiance with it so I guess this is more of a question. Can you link it to your computer to further modify your tracks? This is a feature that I have found a necessity. After a short while, you'll have so many tracks and waypoints on your unit that having a way to organize them is a requirement. I wheel in quite a few areas. I map all my trips, and then save them on to my computer. I can then change names, cut sections up into smaller sections, etc. to label things that need it and even mark sections of trails that are easy, tight, fun, hilly, rocky, etc.
I'm a bit anal with my mapping. It is very helpful though when I go back to an area that I haven't been to in a long time. With just a basic track on a GPS, I wouldn't know where a specific section was I wanted to hit, or a section I wanted to avoid is. Also, when I go back to an area I've been before, I have all the info from previous trips, with none of the info from other areas. That way if I'm looking through my saved waypoints, or saved tracks, I'm only looking through ones from that area, instead of looking through a list with 500 different areas.