I'd recommend you buy the best condition car you can, particularly since there's only a couple of hundred of dollars between them. You'll easily spend the difference trying to improve/fix the lesser car. When purchasing, I'd consider the following in order of importance: body, top, interior, engine, trans, tires, suspension, exhaust, brakes. Electrical issues fall somewhere in between. I keep them out since you'll likey find nagging issues that you'll either decide to live with, like an inaccurate tach, or spend lots of money to fix.
Since these cars are so inexpensive to purchase, you'll find that even just parts will quickly flip the economics of a car that needs work, but is $1000 less, than a nicely maintained car.
Mileage is not particularly important, and low miles can actually be a bad thing. Brakes, in particular, will freeze with low use. Exhaust systems and even engine components don't like to sit over time.
If you're buying in PA, I'd suggest buying a car that passes inspection, including emissions. Many cars are registered as classics which makes them emissions exempt.
Good luck. Hope that helps.