you want smooth and fast in a pump.. find an old school Ithaca Model 37.. there is nothing better in those categories...
It lacks all the aftermarket add on capabilities that youll find for mossberg, remmington, and winchester products.. and can be a bit more pricy due to lack of availability, etc..
but.. if what you want is an action as smooth as a babys butt... and the fastest possible cycle available in a pump.. the Ithaca cant be beat..
I used to run circles around guys doing multiple target engagements that were using Benelli M1's, M4's, and Rem 1100 auto loaders.. itthe 37 is an incredibly fast platform.. that is light, points naturally, etc.. but if you want to hang all sorts of tacticool shit off of it.. (even just a light).. its going to be harder to deal with than other previously recommended shotguns..
If we're talking a "multi-purpose" shotgun.. something that needs to fill home defense as well as hunting and/or other roles (trap/skeet, play, etc..)... its going to be hard to beat a Rem 870 or a Mossy 500... a quick barrel swap and you can take either of those guns from "combat" mode to "duck hunter" mode in less than 2 minutes, for less than $150... and both guns are pretty inexpensive, and readily available used, in good condition all over the internet (and likely at your local gun shop or pawn shop)...