Pass....Accuphase....or......

Pass has it's own sound and you 100% need to listen first, as some reach nirvana and others can't spend much time listening to it.  

Luxman and Ayre should also be considered.  Ayre too has it's own sound and some fall in love with it.  I'm on team Lux myself.

I tested the Pass 250.8 at home with other speakers (Audio Physic Cardeas) but I was not impressed. I hear people saying the XA 25 is a different Pass. Can someone comment on that?

Luxman don't have many power amps to choose from....i think.

I play only HD-files from my hard drive so an integrated is a waste of money. Maybe a Pass HPA-1 can be my future preamp and I get a nice phone amp as well.

Your room is almost the same size as mine. Last year I briefly owned the Parsifal Ovation, great speaker BTW. I have my doubts that the XA25 will be enough. It depends on what you listen to and how loud. The Parsifal is a pretty demanding speaker IMHO. More (and quality) power will be rewarded.

I had the XA-25.  It is really good and will replace 18 Wpc no problem.  I used it with 50W min speakers.  There were a rare few recordings that would clip the highs momentarily at loud levels and I sold it.  That was a mistake.  I now have Corwalls driven by the Pass Int-25.  The XA was in another league with a good tube pre.  It was neutral, no sound of its own, and never sterile.  I found the bottom octave very well defined but weak.  A REL sub blended transparently and it was truly Really good.   Impressive dynamics, noise floor and drive.

The XA-25 is one to audition then. The Parsifals can produce big amounts of low frequencies in my room depending on placement so maybe they work fine with the XA-25?