I am new to this forum and have been reading a lot in the past week. I have an old whistler but would really like to get a new one looking to spend no more than $150. It seems that the best way to go in this price range is getting the whistler pro or xtr series. Which one would you guys recommend? Finally, what is the difference between the xtr 560 and 425? I wish I could wait a liitle longer in buying one but I'm making a cross country road trip in two weeks. Any help would be greatly appreciated.