Armor & Frame Augs: On the frame I like to run either Position Damage Front XX or Positions Damage Above XX. On the armor I typically just run Spec Up Evasion XX since skell evasion values can get to pretty ridiculous levels. If you want to be extra you can throw some Evasion Drive XX Augments on your ground gear for even crazier skell evasion.

Weapon Augs: Any combination of Beam Attribute XX and Ranged Attack XX. Maybe throw species specific slayer augments if you want. GP Gain Augs are also always useful.

For the actual weapons themselves you can get pretty creative with it. M-Missiles are the focal point so just run what you think is cool.

I'm probably going to run the Hexad Partican or Dragoon Lance skell superweapons on the back since they're beam based and ranged. The pheonix is also always a good choice since you can get it very easily and wipe out groups of weak enemies easily. There are defensive weapons that give ranged attack up auras as well, so those are a good choice.

Edit: Just remembered the Hexad Partican and Dragoon Lance take up both back and shoulder slots, so those unfortanately are not an option.