ok i dont know if you will get this, because whenever i post i like get no responses. and i can see like 85 people have looked at your post, but no one has responded. that sounds great that you want to do all that to your car. But i hope you dont like that spoiler on that car? No offense, but i think its hideous.
i have a 99 4 cycl 626 5 speed, and i wanted to do some work on my car too, looks and performance. However, my best way for performance is to get a new engine, the v6 that fits with 200hp. My car stock has 125hp.
So getting turbo or nitrous might make me faster, but i wouldnt be able to compete as well with the big dogs as if i got a new engine and then got turbo or nitrous. If you want to make your car faster, start out little with like intake and exhaust, it gives you more hp. Then go for bigger things. You could upgrade your ECU. There are many things that will look good for looks on your 626 though, so that shouldnt be a problem.
*Em