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					Originally Posted by  skeet
					 
				 
				...I've had 16's when there was good ammo available... 
			
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 What do you mean by "good ammo"?  At least around here, if Winchester, Remington, or Federal makes it in a 16 ga. load, you can find it.  Granted you may have to do some shopping around and/or available quantities may not be on par with those for 12 or 20 ga. shells and the 16s may cost more, but you can find them.
I don't disagree that a 20 (especially the 3") will do whatever a 16 will.  For that matter, for upland bird hunting, doves, etc., I think the 20 will do anything that a 12 will - if the shooter does his part.  I just enjoy shooting my 16s.  They are kind of a novelty and there is something to be said for shooting something that is different from the rest of the pack.  And, since I reload, (as long as I can get wads) I can brew up pretty much any kind of load I want.
Incidentally, I have one of those 16 ga. 870 pumps you mentioned.  It does have screw-in choke tubes.  I even went so far as to purchase an extra 22" barrel for mine for close-in shooting or in the thick stuff.  I like the heck out of mine.