RCCL's ICON of the Seas should hit that number or get very close to it.
Maybe a line such as Oceania, Regent Seven Seas (both are under the NCLH umbrella), Explora Journeys (brand new under the MSC umbrella), Silver Sea, Viking, Seabourn, Cunard, etc. might work better for you.
There are also the "ship within a ship" concepts from NCL (Haven), MSC (Yacht Club), and Celebrity (The Retreat) if you still enjoy some of the big ship stuff.
Just throwing some options out there....