Daishi Widowmaker? Check!
BH's Uber MarauderII? Check!
Let see...
FNR-5X Fafnir. Two of the biggest guns in the 'vers, now on two legs!
KGC-005r King Crab. Dual LB-20X's, a Heavy PPC, and C3i. If no other C3 units, chuck it for ammo!
Daishi Hohiro. Often ignored, but deadly. ER PPC and GR for long range, Large Pulse Lasers for shorter, a Streak 6 for crit seeking and a small laser for...lighting cigars after you win!
Not overly thought out, but there you go!