I need opinions, Schhit Freya+ and an appropriate Amp

Never heard the Aegir but the reviews are excellent and.... it will likely have great synergy with the Freya and Forte’s. The Schiit return policy is pretty solid. Rogue gear always sounds musical to my ears but it will cost more and you will want to up the tube ante no doubt. Linear Tube Audio would be an excellent choice.

pass labs xa25 would work great

I think my Schiit Freya sounds wonderful with my Vincent SP-331.

I like Line Magnetic Audio tube amps, but Rogue integrated amps sound very good.

I will play devil's advocate here. 1st and foremost, I am an old time Klipsch Heritage fan boy, Klipsch Heritage expert, and a retired audio consultant, whatever...….I know Klipsch ( the Forte II was marketed as a Heritage model after it's release ). I understand you want to spend money, likely the same amount, on electronics, as you have on the Forte IIIs. You say it sounds " fabulous " now. So many folks I know, do not feel their systems sound fabulous, as they are always looking for the next upgrade, so, you are off to a good start ( and some of these folks have much more $'s invested than you will have ). Of all of the older Japanese made receivers ( the ones with the dial tuners, as yours ), Marantz is the best in sq ( sound quality ), and, actually sound good with Klipsch. My 1st question : Are the Forte III's set up in their optimum position, and, in relation to your listening seat ? 2nd : Do you hear any room acoustic issues in your room, typically, nasty reflections, or, bass sloppiness ? 3rd : Based on the music genre preferences you have, as well as volume levels you want to achieve ( you have not stated either ), what " more " are you looking for ? In other words, what improvements in sq are you looking for ? What are your sources ( lps, cds, streaming, etc ) ? For me, this will be a good start in helping you. Enjoy ! MrD.