I also have the NAD C-370 ( almost ready to smash it wth a hammer today with my little problem but its fixed now ) and i also replaced the jumpers. I noticed that it was more open and airy and just better. I used some $85 Silver plated copper Clarity Wires "emberglow" IC's that i had laying around. I wouldnt go spend a 100 dollars to replace the jumpers, but i would try something like the audioquest.
Good Luck, Happy listening
Good Luck, Happy listening