Updated to reflect what I am currently personally using. Can burn down Ultron terminal without Ultron getting to phase change so I consider it pretty good.

Standard notation here, I am not a TTK guy. I like big tough comfortable builds. This is something that will give decent clear times while shrugging off anything except falling asleep at the keyboard.

Mucho mucho credit to DirtySquirrel. We worked quite a bit on his Colossus build and I like to think of this as just updating his awesome idea.

Easy simple playstyle. For mobs hold down your run key and make circles. Your minion procs and dark dimension medal will make them disappear. For everything else, use everything off cooldown, hold down steel punch.

Power variants: if you don't need a dash you  could swap heroic challenge over it for an extra defensive layer. Or fissure for a really nice DoT. Could even go wild and pick up the whirlwind force talent and slot steel hurricane in for some spinny action.