2nd on the Burris Fastfire, its a little bit more expensive but as far as quality its money well spent. I have the Fastfire III and its strong enough to hold up to the recoil of any gun we own. It is waterproof enough to be submerged underwater. The automatic light adjustment works great bright enough for bright sunlight and dim enough to still have pinpoint accuracy in a dark room. Came with a nice little cover that could be left on for something like a Buckmark. It weighs 0.9oz, the 3moa dot is very visible. Very low profile.
Paid about $225 for it. I can't think of anything bad to say about it, I wish the mounts for specific firearms were less pricey but mine will mount to anything with a picatinny rail.