Vandersteen 1's and Speaker Cables

Just recently inherited a set of original model 1's and am really enjoying them but have noticed a bit of top end harshness focused in the 4k area. I know it is the speakers cause that is the only change is a system that is pretty balanced. Have had good luck with Transparent and Synergistic cables in the past when trying to tame the top end but was looking for Vandi' owners recommendations of what you have tried in the past. Looking to spend less then $300 used on a set of cables...

Thanks!!