I am a Garmin fan. Frankly I think there are 2 or 3 things to look at when making a choice...most of the more expensive units have features that most do not use or need such as viewing pictures and bluetooth and so forth. A cheap one is going to be no more or less accurate than an expensive one.
1. Screen size. (how good are your eyes? Some of the larger ones are easier to read if you have older eyes but keep in mind the bigger it is the more it may obstruct your view in certain areas of your windshield)
2. Because many range locations are listed by latitude and longitude, not ALL units have that ability, some will just let you enter an address.
3. Map updates. GPS units are cheap enough that instead of updating maps which I think doing every 2-3 years I nomrally just to replace the unit with a new one. With that said, some of the Garmins come with lifetime map updates....so keep that on your radar when looking.
4. Some units will verbally tell you the name of the street to turn onto instead of just saying turn left in 500 ft. Nice but not necessary.
Bottom line...don't think spending more money gets you a more accurate unit....its just bells and whistles with the exception of making sure the one you pick will take coordinate inputs instead of address only.
Also, don't trust them 100 percent...they may get you there but sometimes taking some crappy routes.
Make sure you use it for a while before you want to use it to go on a trip. Program it when you know where you are going just to understand how it works. I have seen people pull them straight out of the box not knowing how to use one as they are getting ready to leave for a long trip....that is NOT the time to learn how to use it. You want to be comfortable in its operation and how it acts which will give you more trust in it to take you on your way.
If you want to save a few bucks I have bought several factory refurbs, I guess new units that had problems and were returned to the factory repaired and look and work as new. I find great prices on new and refurbs at
www.tigerdirect.com Good Luck.
Sorry, didn't mean to write a book.
Charlie