Any Suggestions on a new set of Irons?

I have been playing golf for five years now and I am about to turn 16. I have upgraded My driver, putter, and my fairway but have yet to get a new set of irons. I am good and golf and want a great set of irons that will enhance my game. Without spending to much money (i.e. over about 500 dollars), does anyone have any suggestions? Thanks