Best balanced interconnects under 350

Why not use copper AND silver so as to get the best of both worlds? Harmonic Technology ProSilways are a hybrid design using both metals that should fit your desires. Their XLR version lists for $439 a pair and should be available used for about what you have budgeted. The best description of them I've seen is on HT's Web site. Unlike so many companies that over hype their wares, HT's claims under "Listening Impressions" are pretty accurate. A review was also recently posted on Stereophile's Web site, too. In the interest of full disclosure, I am not familiar with your hardware and make this suggestion based on the stated desire for "dynamic, open, forward sound without digital hash". That's what they gave me.

Not expensive but the best interconnects I've tried are Goertz Micro Purl Silver. I'm using 2 pair with rca jacks and 1 pair balanced. Great results and no bass problems. The Needle Doctor has very good prices on these cables.

Have you tried the line of interconnects by Silver Audio? Check out silveraudio.com

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!