Good USED XLR Interconnect Choices for $300-$400?

If you could swing $400-$500, I would go with the Cardas Golden Cross. Very warm and open cable.

I think it's funny that audiophiles go to such extremes to buy the right cables so their sound is perfect...when the studios that record the music use pretty much any heavy duty microphone cable. While studios do select microphones based on what they are recording and performer preference, few, if any, go thru the extensive "power filtering" and cable selection efforts that I see posted here on the playback end.

Don't some of you think that maybe you're going just a wee bit "over the top"

Ghstudio:

I see your point but I hear HUGE differences when I
try different cables. Some cables sound really bad
to me and then some make the system sound really good.
I seems like voodoo but I hear big differences..