Our first cruise was to Alaska on the Navigator. You will love this ship and not be disappointed. I agree with the posts, above, about the well-appointed and spacious suites, excellent dining choices and crew.
I do hope you'll give Radisson a try. We'd sail on Navigator again, in a NY minute! Once you try Radisson, you'll be a frequent sailer! Last year we sailed on the Voyager and this year we sailed on the Diamond. We've got our next cruise booked all ready for next August on the Voyager, once again. As you can see, we love all the Radisson ships, each of which are special in their own way.