Welcome to the club, and to the world of subarus!
Since you have a bugeye, I must say that you basically MUST get a catless uppipe before you do anything else. The cat is restrictive, not necessary for emissions, and likes to get dislodged and kill your turbo. Do it, it's a bit over $100 and some hours of work - and get a nearby member here to help. It'll cost you some pizza and beer, and gain you the uppipe and a friendship
Stage 2 is a fairly good starting point. That will give you more power, and quicker spooling. This is basically the limit of power mods before it gets too expensive and too hard to dd.
As for other mods, stage 2 works very well without other mods. The next mods you should do, however, are supporting mods. Once you get into that kind of power, you're going to need things like better brakes, and you're going to want things like better handling through turns. The body is PLENTY strong and sleek - I'm assuming ~150 is a good top speed for you? . You won't need brembo brakes, but some mild brake upgrades will help (especially brake lines - bugeye brake lines are squishy).
Hope this helps - also take a look at http://forums.nasioc.com/forums/showthread.php?t=533787 . Got any other questions, that's for what we're here
EDIT: Also, PICTURES! We love pictures here! Get some up, NAO