I have a Marantz 14 S1 and love it with my Triangle Celia’s speakers, which are easy to drive. A volume of -40 plays plenty loud for me using the Marantz SA 8005. A volume of -35 is enough for my low output MC Denon 103 cartridge with the VPI Scout for records. The Triangles can be somewhat bright in the treble, but they do so many things well. With the PM 14S1/Triangle combination, the sound is lovely and only slightly warm. I also have a Marantz PM 8005 which sounds good in its own right, but the PM14S1 sounds better. Both are made in the Marantz Reference factory in Japan.
If I were looking to replace the Marantz, I would want to hear the Rogue Pharaoh, the Musical Fidelity M6si, or the Hegel H200, presently on sale for a reasonable price here on Audiogon. However, the Marantz integrated amps are overbuilt and a keeper for me. Hifi News measured the PM14S1 at 115 watts in 8 ohms and 185 watts into 4 ohms...certainly enough to drive the Triangles.
Good luck on your search. As always, speaker matching is important and probably should be your main goal.
John Dean