Vocal reverbs

[jampater]

Every time I add reverb to the vocals using D-Verb or the other plug-ins I have (True Verb and Renaissance) our Norwegian diva complains that it sounds as if she's singing into a box/plastic bucket. She says she wants something "warmer" and "more open." I tend to agree, but I am not making much progress getting a more satosfactory result. Can anyone recommend some basic settings for any of these plug-ins which might do the trick? Or do you need the right hardware to get really nice reverbs? (In case it matters: we do dance pop stuff and more or less after an Abba type vocal sound.)