Variants:

Heat Variant

 

1. Heavy Plasma Load

2. Arc Reactor

3. Thermal Boosting

4. Reactive Defense Systems

5. Overclocking

Note: You want to have Plasma Rounds loaded for the majority of the time.

 

Heatless Variant

1. Heavy Plasma Load

2. Arc Reactor

3. Autonomous Missile Deployment

4. Reactive Defense Systems

5. Coolant Systems

Note: Plasma Rounds loaded for the majority of the time.

 

Artifacts:

Fist of Apocalypse

 Fred Dukes' Bodysuit

 White Suit Jacket

Vibro-Smashers

Captain America's Silver Star

 A.R.M.O.R. Supercharged Power Cell

 Improved Arc Reactor

 

Legendaries:

i70: 

i80:  (Easier Suit Power management and more survivability)

 

Rings:

 Industry City Signet (physical)

 Industry City Signet (ranged)

 

Uniques:

Slot 1: ,

Slot 2:,,

Slot 3:,,,

Slot 5: 

 

Infinity System:

Time Gem - Temporal Loophole (152 points)

Space Gem - Durability (150 points)

Mind Gem - Mental Focus (150 points)

Power Gem - Strike Through (150 points)

Soul Gem - Inner Resilience (150 points)

Reality Gem - Patency (150 points)

 

Note: Max out Temporal Loophole afterwards with points you gain over time. As for what's next, you could spend points on (Mind Gem - Deep Thought) to get more Suit Power or dump them into War Machine's attributes.