Our secondary vehicle is a 1992 Buick Roadmaster Wagon. Picked it up with 158,xxx on the clock for a song ($700). Currently at 191,xxx miles. It's a beast. Crap gas mileage (maxes around 23MPG on the highway on a good day) but unreal amounts of cargo space (4x8 plywood fits flat), it can seat eight with the third rear-facing row, it is quite comfortable, and enjoys going 75-85MPH. Can also tow some insane amount, but I haven't done that. No mechanical problems, just normal maintenance has kept it alive. It's a real winner. It survived hitting a deer last May at 60MPH. It's got a ludicrous amount of get-up-and-go (at least compared to my 3-cylinder Metro...).
My dad until very recently drove a 1994 Buick Lesabre. He got it from my grandpa in 2003 with 42,000 miles on it (full-on "old man car"). He put about 120,000 additional miles on it and drove it to the scrapyard about a year ago, as the rust was finally making it unsafe to drive. But it was a great car.
My mom drives a 2003 Buick Lesabre that she got in 2009 with 80k on the clock. I don't remember what she paid for it, but it's also been a good car. It's not as nice as the 90s Buicks though in terms of comfort. They also moved the battery to underneath the back seat (try figuring that one out when you pop the hood).
Buicks are great and definitely tend to be cheap to buy and maintain. They also tend to be very low miles (and well taken care-of) as they often are "old man cars." I've never seen anyone less than 40 years older than me (I'm 24) driving a Buick Roadmaster.
Boring cars for sure, but definitely the right kind of boring. 200,000 miles will happen as long as rust doesn't get you first.
This comes up in the Millionaire Next Door - the Buick is a great car for frugal millionaires for this exact reason. You may want to make sure you're not on the dating scene before purchasing one, however.
The few times I commute in my big ugly old Buick station wagon, I heartily enjoy parking it on the far side of the lot, right next to all the shiny expensive cars parked there so they don't get scratched.