Bought one of those for us for Xmas coz our MIO ones were just a pain in the arse. That particular Garmin allows you to update your maps for free for its life. Max, 4 four times a year. Sweet FKN deal. I got it for AU$360 from JBHifi, near Brisbane.
Has plenty of sweet features and is very intuitive. Easy to use and has traffic updates on route and lets you know what's going on on the highways and stuff. At major intersections it pops up an actual photo of that intersection from what lane you need to be in. It says the street names you need to turn into so you don't have to watch the screen. It can even break down the entire journey street by street, turn by turn, and tell you if there's anything you may need to know about road works and shit on the way.
I thought the five inch screen might be a bit big - it just looks it -but it isn't. Makes it simple to view. Highly recommend it so far.
Here's what it looks like on my screen. My car looks like it's giving me the evils.