I have been doing some research and made a couple of phone calls to a couple of legacy people I know playing and came up with this short list based on the current build game mechanics.
In a 5vX PvP kind of roaming world it's all about class stacking and spec groups beyond solid situational awareness and focused shit stomping by everyone (combos and more combos)
Here is the short list that was advised to me (no Order):
3) Spellsinger or Reaper
4) Skullknight or Abolisher or Paladin
5) Templar or Edgewalker
Builds (Max Level) All builds were verified for 1.2 build and I asked around for a consensus before I posted these links. One major thing to consider is that you will have to gear up to really maximize these classes. AA is very very very gear dependent. Average cost is about 1000-1200 Gold to gear up at level 55. One of the big advantages as of right now is using Leather over Heavy armor where possible due to the DR it provides in two channels over the the DR of one channel for Heavy. Just remember these builds are based on 1.2 and maximizing individual skills and stacking combo's based on group synergy.Abolisher SkullKnight Paladin DarkRunner Primeevil SpellSlinger Reaper War Cleric - Templar