How good is Monster 2.4 bi-wire?

I have a pair of Monster 2.4 bi-wire i got for around $250 on ebay last year. They were a huge improvement over my old cable. But i was wondering if i could do better for around the same price. Or should i start somewere else first. My system 2 adcom gfa-555mkII bridged mono, adcom gtp-450, marantz 6000ose cdp, b&w 602s2 and monster 1000i ic's. Any advise would be welcome. I want to upgrade, just don't were to start.

thans
tommy