Besides SunTour parts, what else do you know about the bike? 6/7/8/9 speed? 700c or 27" wheels?
If the bike has 6 or 7 speeds, I would pass. If the bike has 27" wheels, I would pass.
Otherwise, it might be OK for your first touring bike. I am a bit of a steel bigot, so I might not take an aluminum bike around the world, but this bike could be OK for more modest trips.
I would bet that Treks budget frames are not made in the US. There are only a couple of frame factories, and most of them are in the far east. I am from Detroit, so I am definitely pro made in the USA. I would go for whichever frame comes with the stuff that you want on it. There is not much about building a frame that the other reputable frame builders do not also know.
One other thing that you should be aware of. Most commercial touring bikes are really light touring bikes. Most of the people who buy them never throw any gear on them but want the more upright position, and the bike makers know this. My first touring bike was on joy on dirt roads and wiggled when you put panniers on it. So whatever you buy, I would test ride it with panniers first as a condition of sale. Throw gallon jugs of water in the panniers to approximate gear.