If you really want a Pass XA25, Reno hifi has a used one for $3595.
I too seriously considered the Parasound a21+ to use with my recently acquired 0.7's Maggie's but being a frugal Canadian I came across a used Spectron MK III D class amp that has more than enough watts/current to drive my Maggie's and my DT Mythos ST's (91 db) for that matter. The tube pre amp I use is a ARC LS 15 and I really like the synergy between the two. If my used Spectron goes up in a puff of smoke, I will get the A21. So if you do decide on the LRS keep in mind they love power, the more the better. Happy hunting
Agree on choosing speakers first. Once I knew I had the sound I wanted I went through a few demos before picking the perfect match.
If I were to make a wild guess as to what would drive the majority of speakers well, I'd go for the Parasound. When I was looking, I had power up the wazoo, but not quality current. Once I got that, I found I didn't need that much absolute wattage. It just seems the speakers I gravitate towards are usually difficult loads.