I wouldn't buy an American car (new or used) unless you are looking at Corvette/Viper. My first car was an '87 Buick Skyhawk and I spent almost as much time driving it as I did fixing it. I know a few owners of more recent American cars and it seems like they haven't changed much until around mid-late 00s.
An older Honda/Toyota would be the best choice. I'd spend $4-5K on the car and keep $2K for repairs/insurance/gas.
My dad was the same way with Fords, but I picked up a Ranger, followed by a Crown Vic and they rarely needed any repairs.
My dad called them pieces of crap, funny thing was they were the only vehicles always running and available to drive when my parents fancy cars broke down with great regularly. And when something did tend to break, it usually took about 20k miles for the part to fail after it started going out.
The Crown Vics, Monte Carlo/Impala and the Malibu variants at Mercury and Buick shouldn't be too bad -- though rather bland on styling. Though Buick tended to do much better on the reliability surveys due to the lack of SUV models.
Personally I'd stick to the Impala and Crown Vic platforms and the companies spent the more time on reliability of those for the police cars ... so a Mercury or Buick on those platforms should easily get you another 100k miles on a 60-70k mile cheap car with low maintenance costs.
Plus the 7k would easily put you in a 2000+ or newer vehicle anyhow, with a mid to mid-late 00s easy to find.