How to take down mass bc's

I play as protoss, and have played as protoss for quiet some time now. I dont do this anymore, but in the "old days" i used to play bgh quite a lot. Whenever i went up against a terran player, i aways was bombarded with massive amounts of bc's at a later point in teh game. I always wondered, what is the best way to get rid of these capital warships. I always used to psy storm them into oblivion. I think that works the best but what do you guys think?