is 500 your budget for a bare bow or a loaded bow? Bare, you can find some decent bows, loaded and you will not find much unless you go used.
If I was on a budget I would stay away from Martin and Hoyt...great bows and i own a hoyt but there are better bows for the money. Look into PSE and Bowtech, they use to have a bad name...kind of like how Hyundai cars were crap back in the day, but now a Hyundai sonata is as good as a toyota camry but cost much less. PSE and Bowtech have come a long way...just my opinion