I agree with the posts above. I have auditioned the x-1, x-2, x-150, x-250 with my Thiel 2.3's. I own the x-1,x150 are a perfect match. I believe that 60% of the sound is from the pre-amp. I'm saving for the x-250. I concur with the TAS review on the x-250; you get the best of both worlds tubelike performance with the power of SS.
best of luck
best of luck