Pass INT-150 or Bryston b135 sst^2?

+1 on Accuphase.  There will be no turning back though once you listen. 

I've got a pair of SHL5 + (great speakers) and have heard them with the Pass INT 150. For my personal musical tastes it was a very nice pairing, which I'd gladly use in my system.

I've also owned LSA Statement and Musical Fidelity m6 500i amps, both were excellent matches for the Harbeth.

A lot of Harbeth owners like their sound with tube amps whereas I think they really come alive with high powered solid state amps.

Do you have an opportunity to audition them with different amps? 

Thank you for the replies.  jayrossi13, I could not agree with you more.  I had the SHL5+ paired with a Pass XA-30.8 and it was incredible.  It was suggested to me to try a tube amp and they sounded good, but paled in comparison to the SS amplifier that I was using before.  I did some research on the HUG and found out that higher powered SS amplifiers are the way to go with Harbeths (the owner and designer recommends it).  I went back to a Bryston 4B SST and the magic is back!

In a smaller room, I have been enjoying the SHL5+ with Red Wine Audio 30.2 LFP-V and Isabella preamp.  The 30.2 alone is very good but adding the preamp made for a more expansive sound stage and also more texture for the individual instruments, IMO.  I went from another extreme with Belles 350A and 21A with auricap preamp (lots of clean power).  I prefer the Red Wine Audio combination better.