I will throw in another vote for BlueJeans Cable; I had them make a set of XLR's for my 990/7700 and they are very nice; extreamly flexiable and fairly thin cable, you can also get them color coded. I had the 7125 Amp until the 7700 were available and I was using RCA's; did not notice a difference in sound either way between XLR / RCA but I do like the XLC connectors much better.

All of my cables were made to length by BlueJeans and I am VERY happy with the Belden Brilliance Cable and Canare connectors that they use.