I'd like to upgrade my speaker wire

I am fairly new here and still learning.  I have a Yamaha R803 receiver and Vandersteen model 1s.  I'm happy with them for now but I'd like to upgrade my speaker wire. I presently have 14 gauge wire I bought years ago at Best Buy. I need 40 feet.  I've read great reviews about Back Cat but I think 40 feet may be a little pricey for me. I'd greatly appreciate any advice on a good quality wire at a reasonable cost. Maybe under $500?   BTW,  I bought Jim Smith's book as recommended here, great advice, thanks.   Doug