I personally i think zmanalex's opinion on cheap wheels spacers is very true, they might be a basic part, but its basically a part that should not be skimped on, so on this occasion i think your wrong in what your saying bud
Acceptable mileage is what your happy with, a car does not start to corrode at a certain mileage. I sold a 2004 zed last year with 35k on the clock with no visible signs of rust, good luck with your search