Any Boulder pre/power amp users here?

Soon I'll get a Boulder pre/power combo and wonder what the Boulder owners use for the IC's. My dealer said Boulder specifically recommends to use its own cables, which are somehow very cheap compared to their amps. I have no idea what these cables are and wonder if these cables are as good as other high-end cables which we know.

So, I'd like to know if anybody tried any Boulder IC's from CD/DAC to the preamp and pre to power and compared them to other cables.

Also what would you use as speaker cable from Boulder poweramp to Wilson Audio Maxx2?

Thanks