If you are in touch with Mark @ Reno, you may also want to audition a used XP-10 to compare to the X-1. They do sound different. I had the X-1 and now own the XP-20. It's a different price point, but the sonic differences are interesting to compare. The Pass pre amps work extremely well with Pass amps if that is what you have and that MAY offer some compatibility that you won't find with the Capri, though I have not heard it.
Pass X1 and Rowland Capri Preamps
if you've owned or heard both of these preamps, i'd love to hear your impressions of how they compare. i'm looking for a pre and have narrowed it down to these two, however, haven't seen any comparisons that mention how they sound.