GOOD CHEAP COOL LOOKIN PERFORMANCE CAR!!!! HELP?

ok so i want to get a car that i can modd performancely and exterior too....im loookin for something that looks sporty (kinda like a celica except better power n stuff), rwd if possible, cheap to mod, not older than 2000,15k or less, i have a 2500 max to mod with so plz give me some ideas with your selection thanx