My '91 300ZX TT has 15,000 summer / adult milesemotionally I'd want $25000 but realisticly it's worth 15-16000
After you check the obviuse body damage make sure you check the lower door sill and front spoiler for curb damage as well as the wheels. these things are very low. check the mintenaince records the timing belt w/water pump should be done around 50-60,000 miles. i'll check my manual if you need the exact miles for the service. It should cost $500 at a dealer for this