Zu Cables, Z cables and Jena Labs-your thoughts

I will be upgrading my Nordost Blue Heaven Rev. 2's and, as usual, would appreciate your feedback.
Never heard the above 3 cables but they seem to have good feedback. Unfortunately for me, I need a 15ft. bi-wire speaker cable due to the wife/family room factor.
I listen to rock,electronic and jazz.
Jena Labs may be out of my price range.
Thanks for your feedback!