need handling advise

alright so i have a 2003 mustang gt and i want to lower it for that good look but thats not why im doing it i want better handling out of my car and i found the eibach pro system plus kit does any one know if that is worth the 850 or if there is something better out there and also other things i can do for better handling. so anyone got any advise for me
 
How do you want to drive the car? Drag? Road Race/Auto X? Cruiser?

That should be the first question you need to answer before you go slapping on suspension parts.

You say you want it to handle but in what environment? Street? Track? RR/AX Course?

All of these disciplines require a different type of setup to get the most bang for your buck.

John