what are good upgrades to my road bike?

i have a 07 fuji newest 3.0. i like the bike. it works good but I want to make it better. i have aero bars. my rear derailleur got ripped off by a plastic bag so i went with the 105. my front derailleur sucks so im going to buy a tiagra or a 105. im not sure which yet. any suggestions? (tiagra is $20 cheaper) then i wanted to know if i should get 105 or tiagra brake/shift levers and 105 and tiagra brake calipers. i dont know if it would be worth the time and effort and money though. i think im going to race this bike so i need suggestions. i know the bike isnt as important as the skills of the rider, but i kinda want it to be a little better. I dont wanna do anything too crazy like change it from a 24speed to a 27 or a 30 speed or get new cranks and freewheels and a cassette. but just little things that i can do myself. like different handle bars or new wheel set or brakes. i can do average things.
i dont care if the upgrades are more than the bike. if i get good enough components i can just get a new frame sometime. also i dont know where i said i wanted to change the number of speeds or i wanted a 10 spd shifter for a 8spd cassette. im not retarted. i know as much as an average bike mechanic.
 
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