I can't say I have done a lot of A/B tests on my cables in the system, but the Blue Jeans Cable seemed to transmit a stronger signal out of my Nova amp. They were cheap, too, 15 bucks for a pair of 8 foot speaker cables.
I think the Nova is a great amp, I use it as a DAC via USB and Coax output from a CD player. An upgrade to an NOS tube improved the sound of the tube preamplifier, but it sounded great out of the box.