Butcher Pete is my least favorite yet it is the most lulzy and has grown on me.
Civilization (Bongo Bongo Bongo) is by far my favorite out of the soundtrack there, but they're all very, very good.
Let's Go Sunnin' isn't on your list? Really? :/ I love that one... ._.
But I don't want to set the world on fire is the most iconic of it all, and the fact that Interplay wanted it originally for the first game and couldn't secure the rights is just depressing, but all the more better that a fallout game finally got to use it.
edit: Actually, Let's Go Sunnin' is a lot better than the credit it's given, seriously.