There is nothing wrong with buying a car with 70k miles. That's really not that high if the car hasn't been abused and was well maintained. This is why I keep a detailed record of any service I get done.
For a car driven in Texas where everything is like 100 miles away, the mileage isn't too bad if this was a daily driver. As long as you & your mechanic are thorough in checking the mechanicals, electronics, etc... You should be fine. The maintenance cost should be the same no matter which direction you go with. If the car is due for a tune-up, have the dealer cover the cost. Stuff like brakes, tires and other things that need replacement should be covered by the seller no matter which car you go with. If it's not done, negotiate a reduction in the asking price. The biggest issues are the unknowns with the used car you intend to buy. Your used car shouldn't require any maintence at the time you leave the lot. Be warned though, common maintenance cost for the Z is a bit more than your average car. Oil changes are about $70-$100 & new tires run about $1,000 and last about 15k miles.
With that said, it's always better to buy a well maintained lower mileage car over a well maintained higher mileage car because of the inherent wear & tear. These cars are built pretty well, but things will wear out eventually. It might be a "better" investment to buy a lower mileage car if you plan to keep the car for 5-10 years.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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