Suggestions on XLR cable around 400.00

Try the 'Ultimate Silver Dream' by Artisan Silver Cables -http://www.artisansilvercables.com/ultimate.htm

I've tried them against Valhallas & they are just as good, if not better.

Antipodes Komoko would do very nicely. Very hard to beat this cable.

I've been using Acoustic Zen Silver Reference for many years and find them to be a very good all around interconnect.  They nicely balance detail and tonality resulting in a very musical and natural presentation.  They also image and soundstage very well.  Might be just a little above your budget used, but given the level of your equipment I think it would be well worth the incremental investment in the long run.  Best of luck. 

Thanks for the suggestions. I found a Audioquest Sky at a good price and am going to give that a try.