Best speaker cable in the $2,500 range

You might want to add HMS Gran Finale cables to your list. The speaker and balanced IC's are particularly fine, and fall well within your price range.

What's the rest of the system?

I would put the Analysis Plus Solo Crystal Oval 8 up against any on your list above. And these are subtantially less than your $2500 limit!

You should consider speaker, speaker cable, and power amp together as one unit. Some speaker and amp combinations are more sensitive to cable changes than the others. I have experienced some very cheap cables out-performed some very expensive ones in my system. I would advise against setting a price point and only consider the ones at that price. I would try cables in all price ranges up to your budget including the very cheap ones like the Home Depot extension cord that I am using to connect BAT VK-75SE to Vandy 5. You might be surprised to find that the best matched are not necessary the most costly.

There may not be a best cable in the $2500 range. It's possible that you'll go far beyond the line of diminishing returns. Sbank's question about the rest of your system is very important. Besides asking self-appointed audio experts on an internet site to help you spend $2500 on cables is questionable. Call The Cable Company and ask to borrow various cables from their lending library and listen for yourself. You may find cables that sound great for a quarter of your budget. Spend wisely and buy more music.