Krell CAST versus Balanced XLR?

I recently acquired a Krell FPB 300cx and a Krell KCT Pre-amp. Opinions on CAST cabling versus Balanced XLRs? If Balanced, any recommendations?
CAST is far larger and more natural sounding than balanced on the Krell. I've compared the balanced and CAST versions of the same cable into two different inputs of the KCT and feel that CAST wins hands down. CAST is highly recommended.
I was amazed at the improvement CAST made. I have the same two components you mention, I highly recommend the CAST interconnects.
When I recently upgraded my system the dealer gave me some CAST cables. I already had Pure Note and Siltech XLR cables. Sorry but the CAST cables did not compare to those cables in ultimate musicality.

Sonic Genius' Reference Stereo System a/o July 2003:

Martin-Logan Prodigy speakers.
Krell FPB400cX power amp. Modified with IEC power inlet.
Krell KCT preamp.
Sony SCD-1 SACD player.

Sutherland PHD phono preamp (battery).
VPI TNT-HR-X turntable, JMW 12.5 tonearm.
Grado Statement phono cartridge.

Pure Note Epsilon Reference XLR, RCA cables. Rev. 4.0
Pure Note Epsilon Reference speaker cables. Rev. 4.0
Siltech Compass Lake XLR interconnects.
Pure Note Sigma power cables.
The system I heard the CAST comparison on used Tara Labs The One XLR and The One CAST, not the cables Krell sells. For a fair comparison you should compare with Siltech CAST cables.