Onhwy61 is right that the Pass are moer refined sounding than lush. I own the X-250 and also have a X-1 preamp along with a BAT VK-30SE preamp. I am not sure that the best preamp for a pass amp is a pass preamp because I have not heard all of the combinations. The X-1 is a very natural, clear and extended preamp. SLightly forward sounding in my system with B&W matrix 803 seakers. You go from tubes to SS with your quesion but if youwnat a tube sound, go with tubes and can drice the speakers you want with them. Otherwise the SS Pass with a tube preamp can work. The Lamms are excellent and would be my choice for a tube setup, but out of my price range. Also I beleive the CJs preamps are warmer sounding with less details than lets say the BAT or ARC tube preamps.
You need to get out and go listen to these things to make your decision easier.
You need to get out and go listen to these things to make your decision easier.