Don't have much more advice to offer up. Just wanted to throw in that you'll want to look at the material that the firearm is made of when you get it. Since you haven't fired any guns before, that might be the biggest difference that you notice. Two guns may be of the same caliber, but if one of them has a synthetic stock for instance, then it has the potential to have a lot more recoil.
I've had both a Remington 870 and a Browning Auto 5 that I inherited from my Grandfather. Both were definitely sweet shotguns. If you look around your town you'll most likely find a local shooting club. You'll find that firearms enthusiasts are usually just as friendly and open as us wet-shavers are. You might be able to find a group of guys to go out with that would let you try out several of their diffrent models. They would be more than willing to help you find your first firearm.
All three companies have been around this long because they make a good solid product. A guns are about as YMMV as razors since everybody is built differently. So its up to finding which model you enjoy shooting the most and your most comfotable with.
Les temps sont durs pour les rÍveurs