Speaker cables bi wiring for front towers

$500 or <

However, I am curious what people’s views are on how much difference these really make as you go up the price level. 

I’ve not had much luck in bi-wiring. While I have not done extensive testing, a couple of my systems have been biwired. Now, bi-amping, that is a different story.
 

What is your equipment? This can help. There is a place under your UserID to put some photos and ID your equipment. This really helps us tell where you are coming from.
 

My default budget wires are DHLabs. They make really great cost effective  products.

I would recommend as high a quality speaker cable as you can afford. Skip the bi-wire. once you have optimized all the power cords and interconnects then add a set of good jumpers to replace the flat plate jumpers that come with your speaker… later.

This would be my first venture in bi wiring, it was previously bi amped but I’m now using a McIntosh mc300 to the mains. Marantz SR5011 receiver.  I have it completely pulled apart at the moment, but will add a photo when back up and running! :). I will check out those cables you recommended!

Kimber 8PR or 8TC in a 3/5 config

At your price you should just buy better single wire cables and better jumpers.