how to spend $1000?

Are you more interested in power or handling? For power, get an intake like a C&L or JLT and a tune. For handling get a set of Koni STR.T shocks and struts with Steeda Sport springs. A set of adjustable sway bars would be good too. Let us know what you want and we can guide you a little more.
 
I am actually asking for a friend of mine. I have a fox mustang and he thought I would know about his car too. I know virtually nothing about the 05 and up cars. He is looking for more power at this time.