I just bought the tomtom one xl for $189 at u2buy4less and let me tell you, these things are great if you don't have one. I was so confused on which one to get, but this one you just plug into your cig. lighter, type in the address you're going to, and it talks you there by a guy or girl talking to you while showing street names to turn on and the current street your on. They are so cool and I'll never be without my tomtom!
by the way, there are sites that sell them for less, but they are scams. Once you buy from them, many tell you they are out of stock and try to sell you the more expensive brand. The two sites that I've bought from that are legit and that I trust are u2buy4less.com and elex4less.com