If you've got the time, go for a first gen camaro. the 69's looked pretty good, and you can get a fairly nice one for 15k, or pick one up for 3500 and fix it up yourself.
of course if you're not into buying premium gas and getting <15 miles to the gallon, this route would not be for you.
if you're looking for value, an old toyota mr2 can't be beat. we had an '88 that lasted us 200,000 miles, and would have gone much more, had we not sold it. It was a supercharged one, and it had a helluva lot of torque for a small car. you had to be careful on rainy days, or you'd sit and spin at stoplights. We sold it for about 3000. Anything toyota makes lasts forever.