My job has issused me a $500 dollar voucher to buy the best GPS I can find, any suggestions?

I work as a college admission counselor, and travel to community colleges twice a week. I would like to get a GPS navigation system, as I’ve discovered that I lack an inner compass and frequently get lost (my atlas has been helpful, but it is dangerous to consult it while driving). I would [...]

Magellan Triton reinvents handheld GPS. Amazingly easy to use, Triton 500 is perfect for the first-time GPS user. And the full-color display, SD-card compatibility, enhanced features, fast signal acquisition, reliable signal lock and precision positioning make Triton 500 an excellent choice for the advanced navigator. The next-generation handheld GPS for [...]

Please note if any additional upgrades have to be bought to add navigation. I could most likely get by with little detail at the city level. I would just like to know how far it is between towns when driving, etc.
Also would like to try a little geocaching. A GPS unit for [...]

From the Manufacturer (October 30, 2008)This is a refurbished GPS. Refurbished generally means that the unit has been returned to the manufacturer, who brings the navigator back to like new conditions. Some GPS may contain cosmetic blemishes. There is a six month guarantee on parts and labor on TomTom [...]

Jeff SandersGarmin GPS Navigation Systems http://www.GpsFrontier.com 04/05/09

GPS Navigation Systems have come a long way

Gps systems have come a long way since they were first designed for the US millitary. The first signal from NAVSTAR 1 was received on Feb. 22, 1978. NAVSTAR 1 was launched from Vandenberg Air Force Base in California and [...]