I have tried just about every 9MM pistol out there and the SIG P226, P228, and P229 are my favorites and I own each. Extremely accurate, reliable, and IMO great looking. There is a good reason that the likes of Navy SEALs and the Secret Service use such SIGs.
To me they are well worth the money and there are plenty of nice used SIGs and CPOs available for quite a bit less than a new one.
The ONLY other brand pistol that holds my interest is the Walther P99/PPQ/PPS.
Try to rent a P226/P228/P229 and see for yourself.
If the one for sale really is NIB I would grab it!!
The only issue I am aware with the P226 is some users of the X-5 versions ($1400 +) with internal extractors sometimes have problems with the extractor. That would not be the case for the regular line of P226 pistols.
PoliceLink ratings of the P226:
http://policelink.monster.com/products/products/257-sig-sauer-p226
I took one of my P226s to me with the range a couple weeks ago for some fun.