Last night I dropped two singularity PBs on Cha Dawn after he peppered a couple of my bases with something like 35 conventional missiles

(which killed a total of about six AAA neutronium garrisons - talk about a stupid cost/benefit tradeoff!). Thankfully I already had 4 ODPs in orbit, cause next turn I needed them all

. Downside is, the mind rape has begun in earnest and the sea levels are coming up. I think I can hold out long enough to transcend, though.
And on large maps I've obliterated captured bases that were too small and too far away from my holdings to bother with -- I usually wait for sunspots before that, though, otherwise I give 'em away to pactmates. I tend to play small maps these days so I've gotten away from needing to do that.
All this versus the AI.