I think I'm going to buy the Alpine 9807 HU, but I was curious what the difference was between the two. I went to circuitcity.com and compared the two and almost everything between the two is exactly the same, but ehre's like a $50 difference between the two. Also, people ranked the 9807 higher than the 9811. The 9807 got a 4.8 rating out of 5 and the 9811 got a 4.7 out of 5. Not a big difference, but just curious what the 9811 has that the 9807 doesn't.