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Some "U.S. made" sigs are roll marked "Made in W. Germany" or "Made in Germany" as the parts were made in West Germany but assembled and fitted in the U.S. after importation. All guns that are entirely made in Germany will have the proof marks. One advantage of the .357 Sig guns is that you can purchase a .40S&W Barrel that can be fitted to the slide/frame (Make sure the barrel is fitted, and not the slide/frame) then you can switch between .40S&W and .357 Sig with just a simple barrel swap. I would like to point out that W. German guns got the rollmark changed from "Made in W. Germany" to "Made in Germany" with reunification of both halves of the nation. Quality didn't change but W. Germany guns have more collectability value while the latter can be had for less while showcasing the same quality.

On a German made Sig the serial number will usually be stamped on the slide, barrel (It is usually blind marked), and frame. There will be hallmarks stamped on the bottom of the slides dust cover as well as on the frame near the serial number.

Unless I missed something in the OP's post I see no reason to look for a fiber optic front sight, it will most likely have a tritium sight on the front. Depending on the age of the gun, the tritium may have gone dark in the sights. Sig's Service plan (Cleaning, sights, springs, ect) is an ok deal, but can be a good deal when you catch it on deal for holidays like fathers day and veterans day. I would say if its German made (look for proof marks) in the current market, 2 standard capacity mags, with good tritium sights along with minimal wear and tear (look under the right grip panel and see if the spring has worn the hole bigger) I would say anything less than $800 is a good deal in my area. A year ago I would have agreed with RX8er and carlson1, but the current market has driven all prices up. Of course the gun I have described is more desirable than average.