So to clarify
Level 8 Monk with 14 STR, 16 DEX, 20 WIS
With Inuitive Attack
8(Maneuver Train) +5(Wis) +2(Impr Trip) +2(Greater Trip) +1(Weapon Focus) = 18 + d20
With Agile Maneuver (or Weapon Finesse depending on the ruling)
8(Maneuver Train) +3(Dex) +2(Impr Trip) +2(Greater Trip) +1(Weapon Focus) = 16 + d20