I personally probably wouldn't buy a used gas vehicle with over 100k unless I knew for a fact what the history is on it...like if a family member or friend has had it since it was new. I'd consider buying something with over 100k if it was the right price, and it was a 2nd vehicle or a toy.
I'd buy a diesel with over 100k...but not over 150k.
Like others have said, it all depends on maintenence. Buying used vehicles is a gamble. My dads 07 Chevy has 280k miles on it...all put on by him. But he has always maintained it and it runs great.
TOTALED DEC. 2014...05 XLT 4x4
Replaced with Blue Jean Metallic 2014 SuperCrew F150, 5.0 Coyote, 10% tint, Hell Bent Steel Leveling Kit, Allied Duals, Weathertecs, Uniden CB