I dont know too many people that have used sprints, the eibach setup seems to be a nice combo..
I know that TEIN springs are very nice, but may lower the car more than you want, and that NISMO springs might keep your ride height to high, but will probably provide the best ride/handling compromise as far as I know.
doesnt really help you on the sprint stuff, but...there ya go.
also, r240NA(russ) has a set of spring that he really likes but I cant remember who makes them, check out the atlanta 240 page and see...-chethttp://
www.240sx.org/atlanta/