My advice would be to consider going a different route. You're willing to spend up to $1000 for a pair of cables, but that's almost the cost of one of the components in your system. That's not a very good deal. Not only that, you really don't know if your current cables are the source of your problem. On top of all that, it looks like you won't be trying the cables in your system before you buy them. It's your money to do as you wish, but if you are looking to fail, this is exactly how to do it.
Before you start spending on cables in this price point, I would suggest you look at upgrading active components first. They make a much bigger difference. Its always better to deal with a component that's the source of the problem as opposed to trying to mask it with cables.
Mitch2,
"My experience owning the Double Barrel was good with high powered amplification into moderate sensitivity speakers but I thought I detected a little something in the upper mid to high frequencies that came off as very slightly "rough" in direct comparison to the quite similar designed Harmonic Technology line (Pro 9+ and Pro 9 Ref) so I use the HT cables. Maybe this is related to the use of Dupont Teflon dielectric in the Double Barrel cables, compared to foamed PE insulation in the HT cables (although the new HT Pro 9 Ref do use some TeflonÂ). The difference was small and I could live with either of the cables."
The roughness that you are talking about is almost certainly due to the cables being copper. You probably have a fairly revealing system because most people don't pick up on that (or they do and just don't know its the cables). Overall, solid core seems to deal with this better than stranded, but almost every copper cable I've tried has this trait in some form. The better Audioquest and Tara cables are the only ones that I have come across that don't have that roughness. I haven't tried every cable, so its likely there may be others as well.