Let's see, the Titanium sale was already used in the previous suggestion, and the total sweets were around ~20 keys

http://backpack.tf/suggestion/58bf3628e3387721576cdbf3

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I thought the duped Spartan mini was a bit low, but then I found some sales:

http://backpack.tf/profiles/76561198124516652#!/compare/1492819200/1492905600 ---- 72.5 (taunt sale)

http://backpack.tf/profiles/76561198136284947#!/compare/1489363200/1489449600 ---- Something that would be countered by current 90-key sellers

http://backpack.tf/profiles/76561198066195760#!/compare/1489363200/1489449600 ---- Duped Burning Trib + Bubbling Fro (probably around 80?)

http://backpack.tf/profiles/76561198061738700#!/compare/1489363200/1489449600 ---- Sold for 70 keys here

So 70 might be really close to its pure value.

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Other recent sale on the HKC: Stormy Tosslecap + something else.

http://backpack.tf/profiles/76561198065347016#!/compare/1493078400/1493337600

http://backpack.tf/profiles/76561198125791160#!/compare/1493337600/1493424000

http://www.tf2outpost.com/trade/28896801 ----- That Flip Knife and AK-47 were most likely involved.

Given the SCM prices of both items, this sale apparently is really close to 90 as well.

http://steamcommunity.com/market/listings/730/%E2%98%85%20Flip%20Knife%20%7C%20Doppler%20%28Factory%20New%29

http://steamcommunity.com/market/listings/730/AK-47%20%7C%20Jaguar%20%28Field-Tested%29

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http://www.tf2outpost.com/trade/28863747 ----- HKC seller @ 90 keys for a month.

So ignoring the Titanium sale (because it's over 2 months old), we have sales @ 90 and ~90(?). With the Outpost seller supporting the drop, this should be fine.