Primary: BR - a tricked out super fancy one, extended range, stabilisers and kinetic bolts, energy bayonet; good all rounder.
Secondary: The Answer, so I can be a Spesh Mawhreen and purge the xenos with purifying, explosive bolts of salvation; and for when you really must kill every mother -Yoink- in the room.
Tertiary: Hmm, choices, choices. I want to be able to make vehicles and big things dead soooo, Rail gun, one of the multi shot ones, I don't want to be carrying around too many large and cumbersome weapons.
I know its only 3 options but I'm an SII dangit, I also acquire two CE pistols, one to hug when I take a nap, the other to make filthy xenos and Innie sympathisers take a dirt nap. Also i'm having a Reach healing Bubble Shield, and a H4 Combat Drone, I will name him Vernon and we will merrily slaughter foul xenos scum, thus making the galaxy safer for Humanity.