I put A Bushnell Elite 3-9x40 with a firefly ret. on my Mossberg 835 slug gun. and love it. I'd much rather have a great scope on a cheap gun than a cheap scope on a great gun. Buy the best scope you can afford. 3-9 power is IMO a great choice for shot guns and I also like them on my .22's. If I'm in an area that I expect close range shooting, I carry my gun with scope on 3. If it's a little more open, I'll dial up to 4-6. If I see a shot over 75 yards, I should have plenty of time to dial up to 9 if needed and 9x will get you out to the max 20 ga range rather nicely. 3x will give you a faster eye and bigger field of view. I took the scopes I liked and went outside in the dark to see what scope I could see the best through. The 40mm Bushnell Elitescope picked up as much or more light than some of the 55mm scopes. I'd never again get a scope that depends on batteries. I've had a bunch of them and every one has let me down. I forget to turn off or they get too cold or don't have time to turn it on....The Fire Fly retical is awsome. Just before dark shine a flashlight into the scope, (even flicking your Bic will get a little glow going) and the retical glows. I handed my gun to a friend at the public hunting parking lot in the dark, told him to check it out. Next thing I know my gun is being passed around the parking lot to complete strangers oooing and ahhhhing over the scope. Look through mine, then compare it through there own. I have yet to have someone show me a better scope for less money. I paid about $200 1 year ago. I'd save some cash, go to the gun shop, and look through every scope in your price range outside in the dark. You don't know if they will allow you to unless you ask. A good gunshop will bend over backwards to sell you a good scope, doesn't mean you have to buy at gun shop prices....first find the scope you like, then shop for the best price on that scope. Keep in mind though, the gunsmith has to eat too, being able to see what your getting before you bolt it to your gun is worth something. It's probably better than trading guns with strangers at a public hunting parking lot. lol
My thing right now is trying to find scope covers that are worth the money and effort. I've tried a bunch of different flip up scope covers and they've all been a waist of money. They seem to work good until you get them outside in the cold weather, then they wont stay closed. Useless when you need them, a pain when you don't need them. Does anyone make a see through, flip up, set of scope covers that are worthy in bad weather?
American by birth, hunter by choice.