As mentioned above, bolt one are not going to do alot in the power adder arena, however they are more like "drive ability" upgrades.
The throttle body will make you throttle more responsive and that is kinda nice.
Pulleys are an on going debate but I bought a used ford racing/esslinger under drive pulley and did notice a difference. I am not one to say a sticker added horsepower or what-have-you. But when I out on that pulley there was a subtle change, like I had been driving with the AC on and finally turned it off.
Overall, if you want a noticeable gain, boost it or hit it with some nitrous....or both if you feel adventurous :)
..:: sleestak ::..
"Our mother of blessed accelleration, dont fail us now!" -- Elwood Blues