I just purchased a new portable GPS unit to replace an older model and I LOVE IT!
The new Garmin I3 is TINY (about the size of a baseball, maybe a little smaller). It automatically calculates your route, and if you miss a turn, it automatically recalculates it to get you back on track. It gives you turn-by-turn voice directions and the new 3-D view is awesome. The color screen is razor sharp.
Visit
www.garmin.com to read more about it. I would highly recommend it. The MSRP is something like $425, but it can be found for $324 from various web retailers. Just do a search at
www.mysimon.com or some place like that.
Actually, here is the link which takes you to the I3's info page:
http://www.garmin.com/products/spi3/