Rap music on high-end speakers

Hello,

I have audiophile taste in gear, but not in music. I listen to rap music, and occansionaly R&B. Is there anyone out there like me? What do you listen for when buying gear? I was wondering what are the benefits in getting better gear? I want to upgrade the speakers to either proac response 3.8 or wilson cubs. Here is my system:

Levinson No.23
aranov ls-9000
Platinum audio reference 2
Paradigm servo 15
kimber speaker wire
esoteric component wires
amc cdm7