Well, all of the ones you mentioned are good guns. All will work, so the first big hurdle you have already cleared. The rest is gravy.
Decide first if you want semi-auto or pump. I personally lean towards pump shotguns, simply because they are more reliable than semis, all things being equal. But thats me- lots of tactical people use semis, and they seem to work for them.
Once you get the semi/pump question out of the way, you can start narrowing the field. And like Dave said, so a search. This has been hashed/rehashed/rerehashed already 
Mike
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The axe bites into the door, ripping a hole in one panel. The maniac puts his face into the hole, cackling gleefully, "Here's Johnny...erk."
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"True pacifism is the finest form of manliness. But if a man comes up to you and cuts your hand off, you don't just offer him the other one. Not if you want to go on playing the piano, you don't." -Sam Peckinpah
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