Great XLR for $300 or less used

http://www.bluejeanscable.com/store/balancedaudio/index.htm

Acoustic Zen Matrix Reference MkII.
Harmonic Tech Pro-Silway MkIII

On the cheaper side, don't laugh, but the BlueJeans XLR interconnects are really, really good. 30 days return too, so you can even send them back when you're done!

Get an Audio Metallurgy GA-0, often sold new on auction here on Audiogon. You should be able to win one for less than $300. In my experience this cable is hard to beat.