Looking for a SS integrated Amplifier recommendation going into a new system

I own the Hegel 390.  It's starting to break in and it's awesome. Owned lots of stuff in the not real tweeky AP realm,  it's wonderful!

Marantz PM-10.  Nice speed, full realistic sound when playing classical music.  Excellent mid range on vocals.  Can also rock out.

The Pass Int-25 delivers the sound qualities you desire and gives you up to about 100 watts into 4 ohms. Drawbacks: takes about an hour to sound its best, gets up to about 50 degrees C, and is not the greenest of gear. 

Another tube suggestion, Mike Sanders' Quicksilver Integrated Amplifier. It is rated at 20W and drives Focal Aria 906s, rated 89.5 dB, just fine. The Quicksilver replaced a Yamaha A-S501. My music sources and room source are close to yours.

@Op,
I had the exact same Sierra towers with raal and ran them first with a marantz pm-15s2 and later on with a parasound halo a23. I thought I loved the sound of both until I got a pair of PBN speakers which opened my ears to the fact that the raal tweeters were just to thin in their presentation even so they gave a great sense of space. Mainly they did not sound strong enough to fill the room with a solid realistic sound. After experiencing the solid live like sound of the PBN Montana XPS, I could not ever go back to the light beautifully airy sound of the Sierra towers. However they were a great step up in my audiophile journey. If I could do it over I would pair them with a leaning dark sounding amp for sure.