Get one with a 12 volt adaptor to save on battery life... and use it in your truck on the way to work, to get groceries etc. until you are intimate with all the functions of your model. Then enjoy, they are amazing.
if i were u i would get one for a car. That way u can use it there as well. You will need to maybe modify the mount to make it a little more sturdy and waterproof it. (Zip Loc bag works great with the touchscreen.)
we have a garmin 200 somthing and it works great. the great plus side, is that you can plug it into a sled via the 12v outlet, plus you can use it in the car, plus it logs your top speed, avg speed, mpg, stopped time, traveled distance, and you can download icons, and you can get trail maps i believe and even lakes and rivers are detailed with depth and such. the thing i like about ours, is that you can even put your SD memory card into it to look at photos, say from a trail camera
I just bought a Garmin Oragon 450T for my sled. Just started riding last winter. I think it will be great. Still looking to down load some maps for it. I know there are some free ones, but I want all of the POI on the map also. Any suggestions??