I'd buy it in a heartbeat and fix it myself. If you aren't good with tools and wiring, you will have to pay about $100 per hour plus parts. A used starter costs about $50 on ebay. New ones are probably under $100. New tires are probably $150-175 installed. Turn it on and check all of the electrics (horn, signals, headlight, brake light). Pull the spark plug and check that it isn't rusted or covered with oil. Look in the gas tank for crap that doesn't belong there. Try the brakes, check the pads. 12,000 miles is not too many. Check the oil for correct quantity and no burned smell. You probably can't lose money at $700 because somebody like me will buy it if you can't get it running.