Best Tube Amp For Sonus Faber? Or Pass XA-100.5? $6-7,500 Budget, Purchasing Used.


As the title says, I have a pair of Sonus Faber Olympica III's that I am more than pleased with, for which I am trying to determine the best available amplifier, preferably tube. Of course, there are always budget limitations and my budget for this amp would be $6-7,500, and I would be buying used to maximize purchasing power.

Based on a lot of research, and quite a few auditions at brick and mortar stores, various home systems, Axpona, etc. I'm honestly not sure if there are any truly exceptional tube amplifiers available within that budget that meet my needs. These speakers need 100wpc tubed, or 200 wpc solid state, into 4 ohms to really open up and perform. 

If, in the end, there are no really great tubed options, I've always heard that the Pass Labs XA-100.5's were probably the optimal choice in solid state for former tube lovers. I would also appreciate any thoughts on that option from owners. 
nightfall
My vac 200 iq is 100+ watts tube amp and runs warm but wouldn't say "hot."  Leave the cage off of the tube amps and you should be fine.  ARC are not the only tube amp that can handle the Olympica 3.  More options are out there- vac would be at the top of my list.  Best of luck. 
Nightfall-Timing indeed. Wondering if the preamp is the LS-27?

When I auditioned and purchased my ProAc's I listened to them with Ref75SE/LS-27 combo, and then Reference 5 preamp. The Reference 5 was great, but at $5K more I had a difficult time justifying the purchase. That's just me, though.

I currently have the Ref75SE/LS-17SE driving ProAcs D30R's and in the near future will upgrade to an LS-27.
I would think the Line Magnetic 219ia. New is $7,500. There is one on Audiogon now for $5,000.

Again, only giving additional option.