I use Blue Circle BC92. New 8 foot bi-wire pair will cost you $459 list.
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Zu Cable Julian speaker cables in a Biwire configuration are great in your price range. If you really want their best, get the WAX speaker cables, they are not Biwire, but they will make jumper cables from the same wire for your speaker posts. I upgraded to these and am very impressed.
If you want to see my further reviews on both these cables, check out the Zu forum at www.harmonicdiscord.com or check out www.zucable.com directly.
Note they have a pair of WAX up for auction here, and it ends later today