Best balanced interconnects under 350

For the price range you are in, the Harmonic Technology ProSilway II have the best and the most positive reviews.
If you look at how many hi end stores carry their products, well I think it speaks for itself. I have just purchased 2 1/2 pairs of the HT Magic. I believe they are at www.harmonictech.com

Cardas Nuetral Reference needs to be added to you list!

I recently bought the "Silver Lace" from HomeGrownAudio and am VERY pleased with it. It has 8 braided strands of solid core, 26 gauge silver wire with high quality RCA jacks, and you buy a 1-meter kit (DIY, assemble and solder) for about $180. I've used a lot of different cables in my system, and haven't heard anything that comes close at this price to the "Silver Lace". If interested, go to HGA's Web site: www.homegrownaudio.com

I reccommend another balanced transparent super interconnect.I dont know the length needed but if you can wait the 1meter ones come up for the price you mentioned from time to time and cheaper.Picked up my 1meter for $250 and my 3meter for $400

I am currently using Synergistic Research Kaleidoscope Phase 1 balanced cables in my Audio Research/Magnepan system. They are slightly layed back and very detailed. I would give them a try. Oh yes, I happen to have an extra XLR for sale. Retail is $390 you can have for $150 if interested.