Which Amp to complete my system?

definitely tubes with Klipsch horns.

And Although the Pass Labs Amps are some of the best SS imitators of tubes, IMO, Pass amp still will not do u justice.

The PSA BHK 250 would be too much power for easy-to-Drive-Klipsch horns. 

The Sonic Frontiers, Vincent and Rogue would be fine, but they do not match the high quality of the BHK hybrid Pre. So  I would bump it up a notch and quality for the team to amplifier, since it’s the last electronically is influencing the sound before it goes to your speakers. 

Consider Cary, Mystere, Primaluna, Quad, etc

A pair of small monos would be perfect IMO

If you cant go Mcintosh maybe a pair of upgraded Dynaco MKIIS mono amps. I used them with my Klipsch Belles with good results. Now i used Mcintosh MC275s with them. there is a difference but i still love the dynacos  tbh i cant bring myself to ever sell them. Def tubes with Klipsch though. Ive tried several solid state amps but even dead flat the horns i cant listen to them for several hours like  i can with good tubes.  

Herron Audio M2.  Honest.  Musical.  Not bright.  Excellent.  150w@8ohms, more into 4ohms, less into 16ohms.  

I have a Mac 2205 to drive my La Scala's, but the best sound came from a H.H
. Scott model 222 tube amp that I had restored! Not a lot of power, but then again you really don't need it due to speaker efficiency. 

 I am totally baffled by a lot of these recommendations. Really don’t see the need for hundred or 150 W amplifier on a speaker that is over 100 DB efficient.
you need a warm sounding amplifier preferably low power tube. 
 That rules out sonic frontiers and audio research. 
 You could get a good quality EL 84 amplifier for little money that would do the trick well.    Or low powered SET