As far as sights go for a turkey gun, I have a hard time recommending anything more than a Burris FFIII. Battery lasts forever (not literally, but a really, really long time), stands up to the recoil of 3.5" magnum turkey loads, low-profile, and parallax free. Adjustable brightness, and your choice of MOA dot size. As far as price/performance goes, hard to beat, IMO.
Some do want an actual scope, though. I hunt with a friend that has to use a scope because of his aging eyes. He went with a Weaver 1-4X24 with their turkey reticle, and he hasn't looked back. Loves it. I haven't hunted with his gun, but I did do some shooting with it, and it is a pretty sweet little setup. As long as my eyes allow me to go without a traditional scope, though, I will. To each their own.