There are many members with 70000 k's plus. I think you can buy with reasonable confidence. Do your research on this forum about warranty claims that people have made in regards to smoky turbos. Check to see if the cars you're looking have has this done.
Not sure if these links have worked, but there are 2x GENI's with your budget and similar k's your after.
http://carsales.mobi/cars/details/?R=11949611
http://carsales.mobi/cars/details/?R=12045838
GENII here for $27,999
http://carsales.mobi/cars/details/?R=11953527