Any recommendations for a type of non unique - one handed weapon that should be used with a pure summoner? I am looking at all the mods for the various weapons and nothing really jumps out at me.
Outside of the normal one handed weapons, in there any must have unique weapon for Summoners like Searing Touch is for a Fire Witch?
Depends on what you plan on doing, there are a bunch of spells you can use to support your minions, with those you will want to use either Wands or Kris'. If you intend to not use any spells to support your minions, then I recommend getting a unique that does support them.
Chober Chaber, a unique 2H mace gives +1 melee and +1 minion gems and up to 40% increased minion life, it can also be 6 socketed since its 2H.
Queens Decree, a unique 2H sword gives +1 max zombies and +1 max spectres as well as +2 max skeletons, gives 15% minion life and damage as well as 200% skeleton duration.
Midnight Bargain, a unique wand gives +1 max zombies and spectres as well as +2 max skeletons, also gives 20% minion speed and 30% minion damage but it reserves 30% of your life (not allowed to use with CI).
Matua Tapuna, a unique shield gives +2 to minion gems, 10% increased effectiveness of auras on yourself AND your minions and when crit you will spread tar on the ground like the zombies from coves. (if you use Necromatic Aegis, when your minions are crit they will spread the tar).
Of all of these, Midnight Bargain is the only actually expensive one. The reason to invest in uniques for summoner builds is because the +1 to spectres is absolutely huge, you start with a maximum of only one, and you can only get a maximum of two without uniques (there is a +1 max spectres passive node at the top of the witch tree). But with uniques you can get 4 with one weapon and the Bones of Ullr boots, or 5 if you use two midnight bargains and Bones of Ullr (not advisable).