My parents have an 05 G35 Sedan premium package, fully loaded except for Nav, it's got 100,000 miles. They are thinking about trading it in on an 04 LS V8 with 36,000 miles and paying the $3000 difference. Although it has 100k it's almost all highway miles and the car has been maintained by me, with full synthetic fluids throughout the motor, tranny and diff. The LS is at the dealership I work at, it's in the service right now getting the AC fixed and that was the only thing wrong with it. What do you guys think? The cost is $13,900 for the LS...