I am looking to stay under the $200 mark if I can. I live in a combination of some Flat land and Hills and curves. I drive about 1,000 miles a week in my work truck in Western Indiana, around the Terre Haute area on INT 70 and Hwy 46. Of the 4 detectors, which one do you all think would best fit me. Which one? Escort 8500, 8500X50, Beltronics 955 or Whistler SE series? ALso, what bout getting a RD on ebay, Yea or Nay?