Since I do a lot of traveling for gigs, I figured its time to buy a GPS. I'm looking for something that doesn't require me reading a manual. Operation should be obvious and easy, and should have options allowing me to avoid certain routes etc.

What do you guys recommend? I'm not looking to be cheap, but I don't want to splurge if not necessary. Also, since I live in Australia and travel there often, would I be able to use one that I buy in the USA, internationally?