im at 214k in my '04. I do drive reasonably, i dont redline it, corner hard or any of that. I had my mechanic look at it a few months back, his words are that a properly maintained 3.8 is bulletproof. He says that I should have no problem getting 300-350k out of this car.
By contrast, my mother has a 2002 Kia with 126k and it is held together by bondo, gasket gunk, and prayers.