Your question:
... I have spent around $2,000 for cabling. I am figuring that those are what many of you would consider basic cabling. I see folks spending much much more for cabling. What does investing in high end cabling buy you? How does it effect the final outcome? Will the sound be richer and more realistic? What high end cables are recommended for the system I have? How much should one expect to spend for cables for the system I have assembled?
Your answers: Better sound; yes, it dramatically effects outcome; yes, richer and more realistic; approx. $10K thereabouts. I have reviewed many cable sets that are much more expensive, and with worse sound than the one I will recommend.
I recommend the cables I just finished reviewing for Dagogo.com (review to be published soon): Iconoclast by Belden's top models of speaker cables and interconnects (either XLR or RCA), and BAV (Belden Audio/Video) Power Cords.
You are in a position to do things correctly. Making a mixture of different brand cables is not doing things correctly; it's playing at system development. Compare entire sets if you wish to purposefully establish a baseline and advance your system.