Great price if the car is in good shape. I drove an 02 WRX with 67k, it was listed at $22 000. Most amazing machine I've had the pleasure of driving, so at that price I would be very, very tempted. This one was (I was told) owned by an older man and had full service history, so a very good buy, even at the higher price.
As others have and will say, get the car checked out. I saw a WRX not long ago on it's third clutch - they are often driven hard, so exercise extra caution with this one. But all in all... awesome car, good price.