Ive been riding on Stock stuts with Progress springs for over a year now and they havent blown(yet). When they do I will most likely be getting a pair of Tein SS's.
A set of Koni Yellows will run about $530 plus another $200 for the Eibachs makes for a very nice setup. Try to remember for that price you can get the Nismo($750) S-tune combo or a set of Tein Basics($770).
BTW: KYB now makes GR2 struts for the B15.