I want to be able to go on unplanned, winding rides without getting lost. All I really need is a map and a "go home" button. I don't care to have route planning, biometric feedback, etc.

I'm looking at a flyer from a big-box electronics store that shows nav systems for cars. I can get something in the $100 to $150 price range, and most seem to have handlebar mounting systems available on the web for less than $10. The models in this flyer are the Garmin nuvi 205W and 255W, and the TomTom XXL540S.

Are there drawbacks to this approach that I haven't thought about? If you have done this, what model(s) have you used, and are you happy with the choice?

Thanks in advance for any feedback.