Eustatic would be more scientific as well.
Geology (and related sciences) have always been difficult in having a consistant terminology. Take the classification of granites. It took an international committee to approve a classification scheme, but there are still others also in use.
Oh well, here's a nice little primer on glacio-eustatic sea levels, and, from the same site, Isostasy. They are also the first two links I found googleing "eustatic sea level isostasy" ;-)
Haven't tried that on the beta version of google scholar, which is a pretty cool search engine. Maybe later.