Frankpiet,
I've heard the top-of-the-line Boulder linestage and phono stage in a system with other components which I have some familiarity. The system sounded very smooth, pure and sweet, but it also seemed to lack the dynamics and liveliness that are the hallmarks of the rest of the components. Because systems are tricky to evaluate, I cannot say that this is an inherent characteristic of the Boulder components. I am just bringing this up for you to consider when evaluating the Boulder integrated.
By the way, the flexibility, controllability and ease of use with the Boulder gear was up there at the very top (similar to Levinson, BAT and the VTL 7.5).