I know I'm a bit late, but Welcome to the family [MENTION=3944]captaindrp82[/MENTION]! You'll love your STi, and you'll definitely love the community at IGOTASTI. I've been here since October and I can't say enough good things about it. The driver mod is the most important one for sure...just getting used to the power, how it handles, etc etc. It took me at least 3 months to get used to all of that. Then again, I came from an 2000 H22 Honda Prelude. Anyway, the mods you've already done are some good ones! I would recommend suspension mods over power to help with the bit of body roll it has going into corners and to generally tighten it up.
I look forward to future updates....and make sure you start a member's ride thread! :subaru::sti: