I have been doing some research and reading the reviews and have heard mixed opinions. I am looking for a good radar detector under or around the $100 price range. I think I have narrowed it down to two models, the whistler pro 58 and the whistler xtr 325. My main concerns are just detecting radar and reduction of false negatives. Can anyone tell me the differences between the two and which one they would recommend or suggest another RD in the same price range? Also, I used merchant hound and found that buy.com and amazon have the lowest prices. I know that amazon is refurbished units but does anyone know if buy.com is as well? I would like to use them since I can get $10 off the price using google checkout. Thanks for the help.