98Z recommends Primary Arms highly, and I picked up a red dot there a few years ago. They have a 1x6 variable with lighted recticle and a BDC grid for 308/5.56 that I am planning on down the line. Got to pay off a few things first. Currently have a cheaper 1x6 I got a deal on and I like the magnification levels. My current one is a first focal plane and the Primary is a second focal plane, which makes it a bit more usable at low power. My cross hairs disappear at 1X!
http://www.primaryarms.com/primary-arms-1-6x-scope-patented-acss-308-reticle-advanced-combined-sighting-system-paps1-6x