Welcome to Cruise Chat.
Celebrity is a Premium cruise line. They are one of my favorite. The Celebrity Solstice will come out in November and I will be going on a 2nt inaugural to check out the ship. It promises to be fabulous with unique and new features. They will have the first glass blowing at sea, they will have a half acre of real grass on the ship which you can play croquet or putt golf, and the Solstice will be featuring a new cabin called Aqua Spa. Celebrity has always delivered great service, and good food and entertainment. Their ships are elegant.
I think treating yourself to a suite for your 10th anniversary would be a lovely way to celebrate. Most suites are more square footage, offer Concierge service, and have added amenities. Not knowing your likes and dislikes, or your demographics though; I would recommend you talk with a cruise oriented Travel Agent who can ask questions and make sure Celebrity is the right fit for your life style. Fifteen nights would be a long time on a cruise if it wasn't the right fit for you.