first off, welcome! Post some pics of your car! I always thought that the sportback was a great car!
How much are you willing to spend?
How much power/handling upgrades to you want?
What are your goals?
Do you want/enjoy a warranty?
Once you speak to this, we can give you a better understanding from there.
In the meantime, I would get a Cosworth drop in air filter, and after break in period if new, switch to a full synthetic motor oil. The cosworth will grant a few more hp, and some better mpg (when not getting on the throttle so much).
Welcome and post up some pics or a vid!:yay: