right now I have an Escort 8500 X50, but I was thinking about upgrading to the 9500i. Is there really a huge difference between the two? I love the X50 but the GPS of the 9500i sounds pretty insane. Is it really worth the 400+ dollars that it costs? Has anyone made this jump yet and if so what do you think about it? Lastly, is there really much of a difference between the Escorts and Valentine?