I would spend a few thousand more for a lower mileage rig.
The other side to that story is, if it's been taken care of well (and if the items repaired/replaced are documented), it may not be that bad at all. Even at $9,000 - as is suggested - 150k mile 100s aren't a dime a dozen. For $9,000, you're still more likely to be in the 225k range, and then the question becomes: well, would my $2,000 be better spent with ME replacing or having in reserve to replace things that might go bad.
Last year, I bought a completely rust-free 2000 with 294,000 miles for a really good price. The truck has excellent oil pressure, doesn't burn/use any oil, drives great, has great air, etc. While I, too, was a little concerned about the mileage, I got it cheap enough that I've gone in and preemptively changed the items that had me guessing (so I could be
sure they were up to par), and I'm still ahead of the game price-wise. The only concern I have is about resale. You're certainly going to have fewer interested parties the higher the mileage.
It's been shown that the 2UZ is probably a longer-life engine than even the 1FZ, so with the oil pressure good, timing belt changed, hoses good, etc., I'm prepared to drive this one for a LOT more miles........It could break in half tomorrow, but that could be said for any used vehicle. It just depends on how much you'll have in it at the end of the day.