Well, depending on how much you want to spend, a turbo setup would be best but this is also the most expensive option. Next, a CRS style blower would give you enough power to play around with if you did abit of head work but l'd rather keep it NA and rebuild the motor. This will give you the least power compared to the other two but you'll have a fresh motor which will cause you less dramas in the future. Also, while you rebuilt the motor you could chuck in a bigger cam, stronger springs, new valves and you could get a slight head port and polish which would really bring the car to life.
BTW: its a 3.8L