I certainly never meant to imply that the bike was in any way inferior because it was most likely built in Taiwan, or because it is TIG welded instead of lugged and brazed - it's an excellent bike. In fact, Trek went to all TIG welded steel frames a year or two after that 830 was made, and I have never heard anyone say this was a drop in quality. There is a certain prestige or intrinsic value, if only to collectors, of a Made in USA frame, but it's not a practical advantage when the rubber meets the road/trail. I am actually looking for an XL Trek frame very much like your 830 to build into an adventure-tourer. I will be over the moon if I can find a lugged model, but the only advantage is aesthetic. I will be happy if I find an Antelope.

The Giant bike discussed is a different animal, though - aluminum frame, F&R suspension, and new enough that it has V brakes instead of cantilevers. If you have faith that the suspension bits are in good condition then it is a superior bike for off road riding.