davek- how much money do you save on gas in a year by driving that geo metro, as opposed to the average of 20 mpg of most other cars. That used engine will pay for itself in less time than you'd think.
Look at it this way:
If you drive 1000 miles in a month, and get ~40 mpg, you are consuming ~25 gallons of gas in a month.
If you get ~25 mpg and drive the same amount, you are consuming ~40 gallons in a month.
Assuming a gas price of 1.50 a gallon, the Metro would cost ~$37.5 dollars a month, or $450 a year.
The 'other' car would cost you about ~$60 dollars a month, or $720 dollars a year.
That's a difference of $270 dollars a year, and that's comparing to the gas milage of your average small-midside 4 cylinder sedan (25 mpg is good gas milage still)
Just think how much more you'd be spending in a 20 mpg car, or a 7-15 mpg v8!
I own a 35 mpg Subaru Justy, and the gas saved from not driving the two other cars (~18 and ~15 mpg) pays for all of the maintenence that the Justy needs. Pretty worthwhile for a 500 dollar car.