start upgrade for nadc370/sony555es/linn katan?

i have the system above with tara labs prism cables.i want to start upgrade.where is the best place to start? the system is for the bedroom and i am listening 70% of the time to rock.any information could be helpful. thank you!
Here's my path:

1. speaker preferably with dual binding posts. Medowlark Shearwater, Totem Forrest or Mani-2.

2. nad c270 amp for bass and your integrated for top-end in bi-amp configuration as your integrated has already preamp outputs for such purpose.