Go to tigerdirect.com they have a whole bunch there, for cheap too.
x2 I have my iphone and use the maps app, it has never led me wrong.Unless you don't have a smartphone, don't bother with the navi systems. Save the money and get yourself a keymap book and with what is leftover take your girl/guy out to dinner. Most people that have had navigation systems complain of getting lost with them or the maps being out of date. If that is the case, just use the free GPS system that comes with most smartphones. I have an android phone with Virgin mobile and it works very well. I have not gotten lost using it.
Consider the Garmin 40LM. ( life time maps) A super feature is "lane assist" which gives you a split screen on the highway for exits and travel lanes. The Garmin seems to always knows what side of the road your destination is located. The TomTom that I had never gave me a clue as to what side of the road my destination was on.Buy one with lifetime free maps. Sometimes the Garmin 40LM and 50LM go on sale for very good prices. At XMAS I bought 3 40LM at $89 each rather than $149 MSRP. The more features the GPS has, the more time it may take to recalculate and you may miss your turns in a city as mentioned in an earlier post.
2009 Versa S sedan MT-6 with 32K miles