I think it all depends on what you're looking for. I've had good luck with
www.racecompengineering.com. They usually get things moving quickly, and prices are fair.
We mostly install springs ourselves, it's really not hard to do, there are plenty of people here who could help you with that, as long as we get a free weekend or something.
If I need to have something installed, I always go to Subaru Specialists in Sacramento.
Hey, I think Eric still has some springs for sale, Tanabe's I think... PM qksubi, you might get a sweet deal.