Pass Labs AMP’s- What is the best Pass Amp Sound for You from past 10 years


So I have an XA-25 and its outstanding. I’ve tested the XA60.8 mono’s and there was not enough difference to move to them; no jaw dropping moments. Don’t get me wrong they were fantastic, but so is the XA25. Looking at the 350.8 or 250.8, etc.... even in comparison the Integrated INT-250... If you love it; want to explain what you like and why? I’m wondering what others are thinking... 
My set up: Wilson Sophia II’s, XA-25, Pass Labs XP-22 pre, Merging+NADAC. 
jahatl513
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Recently acquired First Watt F7. Using with Avalon Ascendant ll in medium/small room. Incredible combination. Pre is Rowland Capri. 
I've been through three Audio Research line stages on one X350.

Every year I talk about upgrading the X350 but so far it really hasn't given me a good excuse to. And I don't really need much of an excuse. Maybe next year I'll finally get a .8.
I’ve recently added a Cary SLP 97 F1 pre for use with the XA25. The Cary is an absolute gift in musicality and I have also added a Tara Labs power cord to the XA which has truly added bass to the setup. I rarely use my XP22 pre now. 
I wonder if an Aleph 1 or 2 mono would be a nice addition???