I'm looking to sell my current car and get a new used one before the end of year...deciding between the cars listed above(years 2005-2007). They are all between 15-20k, and have between 35-60k mileage. What I care about most is reliability and interior design. I don't care about how fast they can go, I mainly want to know which of these cars is the most reliable.
I've only bought from private sellers before as its the best deal(got my honda accord '98 for 5k when kellys blue book said it was 8k at the time of purchase...bought from a dentist who wanted to sell it asap cause he just bought a lexus). But a friend's dad works at a used car dealership and can sell me a car at the trade in value, which is always significantly lower than what they sell it for, and even lower than private party prices. So really the cars above would cost me 12-15k.

My very first car in high school was a '92 cadillac deville(bought from an old lady who rarely ever drove it and her son took good care of it) and got a great price from it and never had any problems with it. But it was at 80k miles when i got it, and I've heard that cadillacs start falling apart after 100k miles. True?