Super Larry,
There are no other Hilton brands in Athens that I know of. I travel there frequently and was disappointed when the Hilton closed. It is one of a number of hotels in Athens which are closing to revovate for the 2004 Olympics. The Sheraton also closed on 30 November, but as of my last visit both the Ledra Marriott and Athenaeum Intercontinental were still open, and would be good choices.
Congratulations and have a great honeymoon!