If I could choose one, it would be Freaks. But I'd love to hear all the Fire albums, they are great as they are but it would just be interesting to hear them performed again. The live version of Blue Girls was amazing. His n Hers maybe too, judging by the quality of Pink Glove (Peel session).
Actually both Spritualized and Julian Cope rerecord old songs in their current style. What if Pulp decided to rerecord a selection of their 80's 'hits' in a modern way. Which tracks would you most like to hear?