IF you are looking for something basic I would recommend either the Magellan Explorist 100 or the Garmin e-Trex units. These are entry-level models that won't break the bank but will allow you to get to know the ins and outs of GPS before you commit to a more sophisticated model. Some pros and cons:
Both units have what is referred to as a 'patch' antenna, basically a small rectangular design that will work well in most conditions. They tend to wander a bit under heavy foliage or heavy cloud cover. This antenna is not as good as the 'quad-helix' seen in higher end models, but the difference probably won't be noticed unless you are out with someone and do a side-by-side comparison. Both units are WAAS-enabled, which means they are able to pick up a correction signal from one of two satellites to refine their position fix.
Both units have the basic display screens - mapping page, pointer page, information page and setup.
Both units are sized to fit nicely in the hand, which means that if you mount them on the dash the display might seem a bit small; not sure how old you are or how good your eyesight is but when I had my e-Trex mounted on my A-pillar I had no problems seeing the display.
The explorist does not have a data port, so you cannot connect it to your computer to upload waypoints to it or download tracks or routes from it. The e-Trex does have a data port but the cable is optional.
You can find more information at
gpsinformation.net Check out the 'Which GPS should I buy' link at the top of the page.
Good luck.