The way Astarion talks about vampirism (my affliction) and that he took Cazador's offer only because the alternative was to bleed to death, made me always think he'd prefer to not be a vampire. At least I cannot recall him ever talking positive about being a vampire. To me, 'find a way to walk in the sun' was a euphemism for 'find a cure for vampirism' all along.
Could be, then again he seems to be pretty ok with it during his friendly epilogue conversation and faced with the astral tadpole, he says that he never wants to change into anything else again either. I don't rule it out, that he might want to cure vampirism but it would be nice to talk about it and hear his opinion on the matter.
