Ellen,
We just booked the July '06 Athens - Instanbul, too! We're veteran Radisson cruisers, but prefer 10 -12 night cruises. It seems Radisson is mainly in a 7-night pattern in Europe.
We heard a lot of favorable comments regarding Oceania from fellow passengers on our recent Crystal Harmony SF/Alaska cruise (while they were grumbly about declining Crystal service standards).
Unless they're holding some cabins back during their 2-fo-1 promotion, it's true that they're booking quickly on this cruise. I was told we got one of the last two available B2 veranda cabins.
We looking forward to experiencing Oceania on the Nautica.
Jack
Oceania Nautica July 2,2006 (plan)
Crystal Harmony 2005 [Ugh!

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RSSC Voyager 2004
RSSC Voyager 2003
RSSC Mariner 2002
RSSC Navigator 2001
RSSC PG 2000