I would keep the DMP . but if not try the Big Bsa . if you can find a good one they are excellent . the bushnell 8+32 is a very good scope , light and a good rangefinder . but dark on 32 mag and it is a front focusser . which means sitting to range find . if you must have a good light scope try the leupold Comp X range . either the fixed 35 mag or the 40 mag are good from £ 600 to about £750 . luck HOLLY
PS some of the early AR5s could be of different qualitys . give it to somebody who knows about em to look at .