What do you think is the best weapon at endgame?

[UmberGryphon]

Well, most of us are convinced that capital ship missiles are _the_ weapon in the very early going, and I am convinced that phased-polaron beams are the bomb in the midgame (heck, I often have them so early that I never actually build a CSM ship, if my nearest neighbors are peaceful). But after the computers start getting high-level phased shields, what's the weapon of choice? (Low-level phased shields are so weak that PPBs are still more than enough).

Sometimes I use PPBs all the way through endgame, just because they're small, they do good damage, and they fire every round. Sometimes I use enveloping acid globules (if I'm organic) or graviton hellbores for the extra range. Sometimes I use null-space weapons. But I haven't really gotten to the point that I've settled into a groove. What does everyone else use late in the game when they have enough research points to get anything they want?