$1000? Easy. $975 to Skip Barber, if you haven't already done so. I ran into one of my old instructors the other evening, and he gave my car a wringing out. Man, I knew it was capable, but those guys are GOOD.
Your NEXT kilobuck should be able to get you a reasonable replacement for those RE92s, and a bigger swaybar. Get one from an Outback, rather than bothering with more expensive alternatives.
Then keep an eye out for GBs on ver. 5 struts, unless you want adjustability, then go for some KYB AGXs. Springs are an open field, dependent upon how low ya wanna go.
This should have you right around a grand.
Resist the urgings of cheap and easy horsepower. There are more gains to be had from tweaking the chassis. I think that my Legacy GT wagon has plenty of power. The 500 lbs less RS kicks out the jams, especially with a manual.
Most importantly, have fun and be safe. The Scooby gods have been taking sacrifices of late, as Trunkmonkeys cringe...