Kirsty MacColl's original version of They Don't Know.
Lurve this song. I think I prefer Tracey Ullman sweetened-up voice on this. It's also the version I first knew.
I heard Tracey's version first too, and I think just judging the two versions against one another with all else equal, I agree with you. The later version has all those chimes and shimmering Spector-esque production things, so it really sounds awesome. (It's one of those songs I can just listen to over and over and over. Total ear candy.)
That said, I can't help but love the version we heard today too, knowing what I know now about Kirstie and how she came to an end.
Sodden thought: Has AL ever played Kirstie's "In These Shoes?"? That would certainly liven up a 2000 set.