Assuming you want new shotguns: look at the winchester, remington (870) and Mossberg (500- I think) pump guns. Everyone has their own opinions and diehard crusaders from each camp can waste a whole lot of bandwidth blabbering about which is superior and why, but when you get right down to it all 3 are solid and priced right. I'd fiddle with all 3 and go with the one you like the feel of best.
Used: Do NOT turn your nose up at an 870 police trade-in. Cops do their darnedest to destroy equipment, but they have found the 870 nearly impossible to ruin. The only reason the 870s end up on the block some budget monkey somewhere decides to issue all new equipment, since the old stuff *has* to be bad (generally a good guess, but wrong in this case), or some PD got a federal grant and decided they wanted new all-black tactical shotguns. Any 870 you see for sale used is probably a good deal: just be aware the cop trade-ins will have coffee stains on the stocks, dings and dents where Joe Friday dropped it on the pavement and slammed the cruiser door on it, cig butts down the barrel, donut powder in the trigger group, etc etc etc...but it will work fine.
Mike
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"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." -Robert Heinlein