From what I can find on-line, haven't checked in-game, but the runes can be bought from the TP.
In terms of getting stats similar to what the PVP amulet provides you really can't achieve those numbers. The PVP knight amulet provides Power/Precision/Vitality (emphasis), while PVE armor is broke into either
Knights: Power/Precision/Toughness (emphasis),
Valkyrie: Power (emphasis)/Crit Damage/Vitality, or
Soldier: Power (emphasis)/Vitality/Toughness
You can't achieve +20k health, 50% crit chance and a high power ratio in PVE. The closes you could get would be using all Valkyrie or Soldier armor/trinkets, for high levels of Vitality and Power. Then use runes and traits like 1-handed strength to gain high crit chances. It could be done, but your build would be highly restrictive and less productive then the standard guardian builds already created.
Edited by indure, 05 January 2013 - 01:16 AM.