Rankings

Primed Reach - +3m Range for Melee. Drastically increases the range and AoE of Melee weapons. Allows Melees to hit more enemies at once from much further away.
Primed Pistol Gambit - +187% Crit Chance for Secondaries. A must have for any Crit Secondary, although Creeping Bullseye can be used as a substitute.

Prisma Twin Gremlins - MR11 Dual Pistol Secondaries. Well rounded weapon, however is largely outclassed by other Dual Pistols such as the Aksomati Prime and Kuva Twin Stubbas nowadays.
Sands of Inaros - Quest for Inaros. Always in Baro's inventory.
Baro Void-Signal - Key to exclusive mission line, awarding cosmetics. Can only be purchased and played with Inaros Prime. Always in Baro's inventory.

Collision Force - +120% Impact for Melee. Impact is a poor damage type and proc, so you almost never want to increase it. Additionally, Collision Force is a potential drop from the Teralyst and can be bought from other players for very cheap.
Buzz Kill/Maim - +120% Slash for Melee/Secondaries respectively. Slash is a much more useful proc, however you would only increase it to maximise Slash proc frequency, in which case Carnis Mandible./Stinger are much more effective in that role. They are also a potential drop from the Hydrolyst, and can be bought from other players for relatively cheap.
Ignis Wraith - MR9 flamethrower Primary. Very good Status AoE weapon, however it is now researchable at a Dojo's Chem Lab.
Corrupted Heavy Gunner Specter - offers little that other Specters (notably Warframe Specters) do not match or beat.

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