You should elaborate what you mean by cool.
By coolest car if you mean AC performance, I suggest you buy Toyota Corolla SE Saloon. Its AC performance is like a freezer.
If cool means reliability, Toyota Belta is a good car in the budget.
Mitsubishi Lancer 2006 is a recommended car if cool means comfort. Civic 2005 Eagle Eye is a cool and comfortable car if you can find a reliable mechanic for suspension repairs.
In case cool means a classic car, my suggestions include Volkswagan Beetle 1964, Jeep CJ7 1980, Mercedes Benz 1983, Mitsubishi Paejaro 1989, Toyota Mark II 1990, Mitsubishi Paejaro Mini 1995, and Honda Accord CF3 1998.
If I were you, I would have bought a Lancer or Civic Eagle Eye in that budget as they both are cool looking cars.