I have an AR Pro and AR Performance series(Best Buy one) cable in my system. I also notice with the cheaper Performance series, it doesn't really fit too snugly but I don't have that problem with the Pro series. Regardless, I tried switching them to see if I could tell a difference and they sounded the same to me.
I've found the cheapest prices for AR Pro series cables at
www.ac4l.com. They're shipping prices are over inflated like a lot of places too, plus they're very quick.
AR Pro 3ft for $9