Hey, Jim... glad to hear the 336 is working out well for you with the 10Ts! I've been using the JPS SC+ biwire on my 10Ts for many years (started back when I first got the Levinson 331). I spent a good bit of time comparing them to different cables via the Cable Company and ultimately found the JPS to work best for me and my room. Haven't done any further exploring in quite some time, but I'd love to hear what you come up with.
One cable that I've heard much praise on (but have not tried) are the Straley Reality cables (www.realitycables.com). They're actually quite inexpensive so might be worth a shot.
Mike