Sculpin is indeed excellent, but I expect a decline in quality of their IPA's since they've been bought by a mega-distributor. Other outstanding SoCal IPA's include Fortunate Islands (from Modern Times) and Coronado Brewing's Islander IPA.
http://www.beeradvocate.com/beer/profile/2447/31763/
http://www.beeradvocate.com/beer/profile/31987/96436/
Maybe those in the Pacific Northwest haven't noticed it yet, but others have: San Diego is the capital city of craft brewing these days, especially for IPA's!