...BIKE? (SERIOUSLY)? I'M A JUST A BEGINNER AND I WANT TO PURCHASE A ROAD BIKE FOR LESS THAN $500. I FOUND ONLINE (Amazon.com, abikestore.com, ebay, etc...) THAT IT COST LESS THAN $300 AND HAS GOOD COMMENTS FROM PEOPLE WHO BOUGHT IT. IS THAT TRUE? PLEASE HELP...