Integrateds are the way to go, I've run them for years. The Raven Nighthawk or Blackhawk will give you everything you are looking for. I have The Blackhawk, it is an excellent amp with excellent imaging and bass. Its best feature though is after running about 90 minutes it takes on a captivating air that is just plain magical. I mean it sounds good right away, but then after an hour or so, wow.
Mine is used with the 98dB Tekton Moab and will go loud, very loud, in my 17x24x9 room. Your NHT are only 87dB, we ran it with some speakers that were also 87dB and it wouldn't play as loud of course but it filled my room with a lot more volume than the 65-85 you're talking. Volume will not be a problem, certainly not in your room. Beautiful midrange, timbre, soundstage and air, it has in spades.
Check out their web page, search around and read reviews. Very highly regarded amps for the money. You will notice they have a number of tube options. There are also a number of tube options not listed on the site. Dave Thompson is a bona fide tube guru with a massive hoard of NOS that he shares only within the Raven family. You don't just "tube roll", it is more like consulting with the sommelier as to the wine to have with dinner in a fine French restaurant. Call and talk with James or Dave. Especially Dave. He set me up with a combination he knows works well with my Moabs. They sure do! They can also help with which amp might be better with your system. I know The Blackhawk is exceptional, but never heard in comparison with the Nighthawk.