Probably teleinformatics. Thaumatech seems to be more combat focused which society can adjust for but the information gathering capabilities represented by teleinformatics would be pretty significant.
Well, lets look at them;
• Agonizer (••••)
• Anger Patch (•)
• Banality Worm (•••••)
• Berserker Splice (•••)
• Biliary Tree of Cynocephali (•••)
• Cortical Adaptation (•••)
• Cranial Cortex Augumentation (••••)
• Devil's Eye (•••)
• Ectocrine Gland (••)
• Evil Eye (<Confuse, Sleep, Terrify, Fury or Hypnotize>) (••• to •••••)
• Hand of Glory (•••••)
• Lover's Lips (••)
• Optic Thorn (•••)
• Personal Defense Swarm (•••)
• Plasmic Caul (••••)
• Quick-Step (•••)
• Regenerative Nodule (••••)
• Twitcher (••••)
• Voice of the Banshee (• or •••)
• Vitriol Pump (••••)
• Weapon of Last Resort (•)
So that's;
a magic-eating bug
a Vampire-detector skin-graft
an anti-magic bug, possibly from the Abyss, grafted onto your heart...

a berserker brain-implant
an anti-poison/disease implant that replaces your digestive tract, need to buy
expensive antacids
brain-implant that makes you think like a Slasher Villain, made from tumors...
oneiromancy brain-implant
can-see-Auras eye-transplant
a can-see-ghosts transfusion
Gaze Attack eye-transplant
rotted and wax-covered corpse's hand, grants hypnosis
Vitae-roofy stored in your mouth, seems like a bad idea
piece of bone stuck in your eye, lets you see openings into other dimensions
swarm of mechabugs
a dead Geist, gives Sin-Eater-Lite powers
speed-booster, made from connective tissues
regeneration, made from a "cyst"
reaction speed booster, spinal implant
vamp-voice, screws with animals and things with boosted hearing
Vitriol-injector rig, gives you flashbacks of another person's memories
retractable claws