Rojo is right: Research huds are very useful.
Also: alien augmentation hud offense, alien augmentation hud defensive are nice.
Try a compagnero (don't know it? look it up on Auno.org)
Heavy bracer for right wrist (20 assault rifle)
you will want a communications relay: drops off alien generals for Util 3
Defensive Biomaterial for util 2 (questionable value) could opt for a treatment library instead
Stuff you could look into / explore are:
electrophoridae gloves: (add energy dmg)
energy damage arul saba bracelets
ring of power - high energy
Ofab armour is very good for soldiers (so is combined commandos)
Might of the revenant (shoulder)
Kaehlers sleeves (36 FA, 36 Assault rifle)
All the stuff listed will add beneficial stats. If youre leveling, you will want to try to keep your add dmg at its max. (best against hecklers)
Using SPB is a great start, awesome weapon, and will continue to be good right through to 210, as long as you try to keep up with new add damage items that become available.
Don't forget to do a few tokens along the way
GL!
" I Don't Like That Man. I Must Get To Know Him Better." -Abraham Lincoln