First: Why was the old thread by Huntar closed?
Too many name and shame threads. Name the coolest Wurm players that you'd give anything to play with!
I'd definitely go with the original Eldurian (not to be confused with Eldarian) or Knightwolf. Both helped me start out in Wurm on Serenity and let me spend several months in their care. Unfortunately both Eldurian and Knightwolf are most likely never going to come online ever again, since it's been several years I believe.