Brettt, they go from mild to wild. Specific to springs, I'm a budget racer (mid-pack) and I run OEM style after market springs that are 350#. On the other end of the spectrum are SE-R guys running 800-1000# coilovers. Likewise, I'm running a stock junkyard engine, while others have full IT built (0.40 over) motors. Speed costs money, how fast do you want to go?
A good BASIC resource would be www.sr20forum.com/forum Stick within the Race subforum and you can ask some good questions and get some good answers, but don't believe everything you hear. But it's a good starting resource for the car.