Pick ROGUE, use money to level up trainer + upgrade weapons ( trainer + exp bonus (@lvl37 %150) + %70 Killer bonus) find a 6 soc bowgun (not rapid, rapid dmg sux) put 1x Auto fire(kills power shot skill but you no longer need to click like mad) 1xdamage, 1xAnti Armor (Since Rouge doesnt have anti armor or bow mastery) 2x Fire Rate (or 1x fire rate + 1x auto fire) and put 6th slot garbage mods before upgrade. ( Also make your Hunter have lvl 10 engineer asap)
My Team: Guardian, Sherif and Hunter to have all party skills.(Even though its not needed) Sherif can be changed with Noble (Its only for taunt skill)
All use auto shotguns, socketed with 1x Anti armor (Shotguns only weakness ;S) , 1x leech (for perfect days and not to lose game) 1x impact (to move them away from your castle walls and even from entering screen :) and lastly 2x Damage mod,leave 6th slots for garbage mods to upgrade and congrats you beat the game :)