I have purchased several UZJ100's over the years...one at 75k miles, one at 113k miles, and one at 202k miles. I daily drive the high mileage one and it is now up to 259k miles. All I have done is regular maintenance and replaced the broken ignition shaft. It has been rock solid. However, I am coming up on the 270k mile service and I am getting ready financially to put out a lot of cash to buy all the parts (and new steering rack) to refresh her.
I honestly don't think it is worth some of the premiums people are asking for low mileage rigs. If you can find a good 100 that has been maintained and isn't a rust bucket, I wouldn't let high mileage be a deterrent. However, you do have to budget for a big outlay of parts at some point (steering rack, etc.) and if you don't wrench on your own rig, it can get super expensive to have someone else maintain it for you. I enjoy wrenching on my rigs, so that definitely helps in the funds department.
However, that being said, I still agree with the statement to buy the best and newest Land Cruiser you can afford.