Thank you all so much!
1) Gray market or not: The seller's position is that there are many such machines here in the US and that all the machines are made in Japan with the exact same parts. The difference is simply which country they were intended to be sold in. And, that it doesn't affect its use, serviceability, compatibility, etc.
2) 24" vs 30": I do have plenty of wetter areas. In fact, I have a Komatsu D37 dozer now that I've gotten stuck twice. Getting the dozer out of mud that I (stupidly) sank to the foot board level is a heck of learning experience, but now that I've learned I'm pretty sure I'll be fine not repeating the process. Nonetheless, I probably will and having the excavator for this is another benefit. That said, I don't know the trailing laws, but it sounds like moving a 30" track machine is more costly and a hassle. Will it help not get stuck in the wet, peat I've got? The flip side is that most of the work I envision will take place in the woods, where maneuverability is important -- not sure if the track width will affect that.
3) I'm told the machine is a 2008 PC160LC-7EO, so I'm glad it matches!
4) I admit I didn't know about Doosan machines. They look nice. I don't need to buy Cat, or any other premium brand. But, checking machinerytrading.com it looks like their pricing is right in line with Komatsus. Where is the best place to find a good deal?
Thank you again,
Joe