I've got SIGs ranging from West German to German to "frame made in Germany" to all U.S. production models. Frankly, I love 'em all, and, based on my extensive experience with SIG pistols, tend to believe the SIG factory guys who say that the current U.S.-made pistols are
better than the old West German guns (with the caveat, yeah, a heckuva a lot more guns than ever are being made, with way more models than ever before, so possibly more lemons might slip through the Q/C process).
There's a lot of SIG snobs out there (just check out their dedicated forum) who turn up their nose at anything that wasn't made in Deutschland, but there's not a lot of reasons to buy into that mindset (other than elitism). Bottom line, whatever P-226 you chose, it's likely gonna be a great pistol that'll afford you a lifetime of shooting pleasure.
Oh, and yeah, the SRT is really worth it.
Two of my favorite 226s in this photo: (on top, middle two) a West German original and a frame made in Germany but Exeter NH two-tone police pistol.