Mookie:
I would suggest Auditioning the Synergistic Research level 3 cables. But before changing-upgrading interconnects and speaker cables, please try the Synergistic Research Grounding Block in your current system.
Looking at your system with two powered sub woofers, digital front end, and amp, I am confident using the Grounding Block will greatly improve your system. Also the Atmosphere cables achieve their best performance when they are in a system utilizing the Grounding Block.
Also I hope all who read this will consider trying audiograde fuses and A/C wall outlets. I have tried Oyaide, Furutech, and Synergistic Research. All are a significant improvement over original devices.
I do like the fact that Synergistic Research offers, supports, and encourages you to utilize their 30 day audition and return if not happy with the sonic change.