Since Southern Watch and Northern Watch had no end in site - if the purely financial cost hadn't equalled the invasion and occupation by now, it surely would have eventually.
Furthermore, the left loves to go off about the "underlying causes" of Sept. 11th. Well, Usama Bin Laden has used our presence in Saudi Arabia since Desert Shield as a key part of his rhetoric. Well, that war is now finally over (This was not a NEW war, just the completion of the first) and we can leave that God-forsaken country and I hope we do.
Factor in also the costs of retention issues, troop morale, the erosion of fighting capability due to constant deployments to Kuwait and Saudi Arabia for a static mission and state of quagmire (The liberals claimed that if we took Baghdad, we would enter into a "quagmire" - well, we were ALREADY in a quagmire, and had been since 1991. This has finally changed.) and you wil see that closing this chapter in history is definitley cheaper.
For the above reasons alone, the recent attack was worth it.
Add to it the fact that Hussein just needed to go out of principle, the whole liberation aspect, and now the regional stability potential we have - plus the ever decreasing amount of space terrorist shitholes have to train and one less potential weapons provider now in existence, and I really do no understand the naysayers.
Oh well, every one I have met so far didn't know what Operation Southern Watch was - so that tells you a lot about their knowledge of the whole situation.
Edited to add: Liberals seems really good at getting us in to open-ended quagmires. Vietnam before Nixon, our "one-year" mission in Bosnia, etc. It is hard to take decisive action when you have no priciples upon which you base your decisions.