I work for Comcast, and consequently I am frequently going to different addresses. I was given a Magellen Maestro as a Christmas gift. It has a 3.5 inch touch screen display and it is user-friendly to the extent that there is just no need to read a manual at all. It is very accurate, gives voice prompts, and will re-route you if you make an errant turn along the route (although the alternative route is not typically the most efficient by any means as it seems to assume you need a lot of reaction time to get back on track). It has made my job a whole lot easier and I like it a lot. 199 bucks at best buy. All said and done a really good unit for the price. My two cents.
