Ponant , Seabourn, Oceania, Windstar, Hurtigruten, Silversea, Atlas
Go to FIND A CRUISE at the top of the page & put in your dates of travel then see what works for you budget & itinerary wise
All have ships that meet your pax count
if you can go in June you will have a better chance of getting into some of the fjords
Keep in mind smaller ships - more $$