I switched from Bookends to Sente as my reference manager. Not cheap, but impressive alternative work flow. Most importantly, Sente also supports BibTeX, although automatic key assignment is less than satisfying; needs manual corrections or assigned keys are unreadable/writeable (e.g., DOI number rather than “AuthorYear”) – so works fine for shorter papers and new imports.
Bookends: http://www.sonnysoftware.com
Sente: http://www.thirdstreetsoftware.com