b18a or b18c?

I was wondering if my stock b18a setup is worth the time and money to build up or is it better to get a b18c (down the road)?
I was planning to add intake, exhaust, headers, and pulleys, but I dont wanna spend money on it if its not going to be that much quicker. What do you guys think? Im going for all motor, the b18c will be down the road probably next summer. But in the meantime since I got it, I was wondering if its worth to get these bolt in products, thanks!

http://www.g2ic.com/forums/showthread.php?s=&threadid=35823&highlight=smoke+you

Hope that will help…
revive that thread for further questions.