I use a Burris FastFire III with an 8MOA dot on my coyote shotgun (turkey use too when rarely go after them), on a Burris SpeedBead mount. It does require a cheek riser, since the mount and body does raise the sightline, but I'm very happy with it. I used to have a Tru-Glo knock off in a B-Square Saddle Mount on another Super Nova, but prefer the slick integrated look and low mount height of the Burris SpeedBead and the lesser body height of the FastFire sight.
I'm not a huge fan of tube-style red dot sights, in general, especially for shotguns. Reflex type, open pane sights offer a lot more heads up field view, so for most applications (not including Bullseye pistol), I strongly prefer open type over tube types.