ARC D-115: What tubes and cables?

Thanks guys, this is the first tube amp that I've owned.
Prior to this, I was using an ARC D-120 that simply got out
of the way and made my Proacs really sing.
However this is an entirely different beast! (LOL)

Goldeneraguy, I was using Radio Shack 18ga solid core cabling with the D-120. (No kidding). So Purist seems like a gigantic leap. Any other sugestions?

Yes!-Sorry for not being specific on the issue- The RS wires was one of those things that simply clicked with my system, and I was really surprised by this. And NO,they do not work well with the D-115. (It is a Mk 2 Hifi Geek).
Here is my System:
Modded Sony DVP 7000
Berning TF-10
Audio Research D-115 Mk2
Proac Studio 200
Audio Magic Xcallibur interconnects/cables.

One interesting development: Last night in frustration I angled the speakers INWARDS quite a bit from the usual position and Imaging improved nicely! However, they still do not dissapear as when I was using the D-120 with the Rat Shack solid cores.

Davef, Thanks for the Nordost recommendation!