At the recommendation of a friend I bought a pair of Zu WAX bi-wire cables to use in my main system between my BATVK-500 amplifier and Eminent Technology LFTVIII speakers. My friend warned me Zu cables take a long long time to break in so I bought'em prepared to take the time necessary to get my system dialed in, but after three months I gave up and sold the WAX. I would characterize the Zu WAX as inarticulate, smeared, and uninvolving. Maybe I needed to give them more time but 90 days seemed like plenty of time to me. Zu offers a 30 day money back guarantee, but again their products are notorious for taking forever to break in so the guarantee isn't terribly useful. If you want to try the WAX buy 'em on Ebay, Zu sells their stuff direct at considerable discounts there. Final thoughts on Zu, very friendly and responsive guys and their products are priced fairly.
I replaced the Zu with some DH Labs Q10 wire and I'm very happy with the change, I would recommend you give DH a try as it fits in your price range and to my ears are pretty hard to beat. Components, room, synergy, and personal preferences vary but I thought I'd chime in and let you know my first-hand experience.