its worth exactly twice what all P226's made in new hampshire are. Sigs made in Germany go through a third party QC control that U.S. guns don't and are twice the pistols. I don't buy any Sig that has any U.S. parts, never will. they are not the same guns period. If you can buy that gun for 600-800 you are getting a super deal, Mags are easy to come by, it should come with two but if it only comes with one don't worry about it.
HK's are the same, we are lucky in Canada as all our HK's are German made and the U.S guns are made in the U.S. again with much worse QC so we are getting the better gear by far.