I don't know if this is of interest to other people but I have a different variation on the Apocalypse options in this poll in a campaign I run.
In that campaign there has been an asteroid strike on the Earth but there is evidence that the asteroid was "directed" by some alien force and (the PCs haven't discovered this yet) there are now alien forces on Earth, who are also using terminator like machines to infiltrate survivor communities.
The aliens have also introduced a bio-plague to kill lots of humans and have genetically engineered plants to create "triffids".
Essentially the reason for my post is to consider combining multiple apocalypse options in your campaign - it's certainly got my PCs wondering.....
