The viability of MNK+Avenger's depends entirely on how Melee Gaiters+2's "Augments Counterstance II" effect scales. Counter does eventually cap, and most Monks already come pretty close with gear and/or Atmas.

New Gun WS looks to be a 2-hit 2-Ammo fTP varies by TP WS. Could be interesting, especially with an 85% AGI mod. Maybe a competitive Physical WS to stand up to Wildfire?