Fat Man,
Welcome to TBN!
My very first Yanmar, about 250 Yanmars ago, was a 1500 2wd. I thought it was the best tractor. Then I went to a YM1610D with the three-cylinder engine, power-shift, modern dash, 4x4, crawl range, etc and thought there must not be a better tractor anywhere. Then I got a YM2010D with a loader...and I knew I had arrived. Now my favorite Yanmar is my current YM4220D. I think I've had most every model, although I know I have missed a few.
The YM1500D is an older model, it is two-cylinder, no water pump (the heat just naturally circulates), it is about 18HP. The front axles are not the toughest, so if you buy one with a loader, don't abuse it.
For the price you are getting, you can easily get into a 3-cylinder 4x4 Yanmar that is a little more modern. Also remember that all loaders are not alike.
There has been lengthy discussion about Vietnamese reconditioned tractors, so you might search for that topic in this forum. You'll find opinions on both sides of that matter.
We do not buy reconditioned tractors. We prefer low hour units that we put through our own shop. If a low hour Yanmar needs the engine rebuilt something, it hasn't been cared for.
It's always best to buy local if you can, but if you want to be able to see a few dozen Yanmars in one place you can come up to Red Bluff and check these out.