I think 'She Called Up' is the best radio single off Time On Earth: it's catchy, has a great groove, and puts a smile on your face. (I've even got used to the silly chorus, though still think a ragtag brass section would work.) It's very early Enz-ish in its loose nuttiness. And the video with a United Nations-like children's choir is really charming.
But just in case you haven't seen this, here's a clip from a recent show in New York. Odd that 'She Called Up' wasn't on the set list, though.