I don't recognize the Ares Sigma - what is that? SMG?
Heightened Concern gets you a penalty reduction of 1 at the cost of a complex action. What penalty are you trying to overcome that you know about far enough ahead of time that you have a spare complex action? Armor seems to be a priority so maybe Mystic Armor. There are a lot of good .5PP and .25PP powers.
Ares Sigma-3 is a SMG from Gun Haven 3, it looks more like a Grenade launcher due to the 50 round drum magazine.
Its my Supressive Fire weapon

Thanks for pointing out the limits to HC.
I've been using it for so long on my 6 Magic characters to maintain a spell buff that I forgot there are actual "rules" to it since I just think of it as Up to 3 point distraction ignored.
What I was planning on using it for was to ignore penalties from damage that I take. But the limits of it mean I will probably change to something else.