It was 750 :3

Youd need to find recent sales on the items involved (except the private and the taunt, as they are in-date). I can try to help you, though I will be away most of the day, so it may take a while for me. If I do not forget, I'll comment here again tomorrow, with some sales on the other hats and a suggested range here. You are, of course, free to find such sales yourself, but no rush

Okay sorry for the delay. Theres a bunch of other stuff here that can be done. brace yourself

Spellbound barnstormer: 103 keys

Sold with showstopper party trick (~43) for searing cotton (~90*) + spellbund pampered (~56)

https://backpack.tf/profiles/76561198127565155#!/compare/1500854400/1500940800

https://backpack.tf/profiles/76561198083073025#!/compare/1500854400/1500940800

https://backpack.tf/profiles/76561198125791160#!/compare/1500854400/1500940800

~103

*see below

Hats that can be updated for this:

Hellfire tree: 80-100 keys

Sold for logo woolen (70) + 11 keys

https://backpack.tf/profiles/76561198083073025#!/compare/1501632000/1501718400

https://backpack.tf/profiles/76561198139171368#!/compare/1501632000/1501718400

https://backpack.tf/profiles/76561198061489334#!/compare/1501632000/1501718400 (remaining 5 keys)

~81

Sold for strange prof original (~10) + strange prof aussie fan (~12) + strange headless horsemann (~35) + 50 pure

http://www.tf2outpost.com/trade/29332700 BO 100

https://backpack.tf/profiles/76561198139171368#!/compare/1503446400/1503532800

Caps at 100

Can be 80-100

Searing cotton: 90 keys

Sold for hellfire tree (~90)

https://backpack.tf/profiles/76561198127565155#!/compare/1500854400/1500940800

https://backpack.tf/profiles/76561198083073025#!/compare/1500854400/1500940800

https://backpack.tf/profiles/76561198125791160#!/compare/1500854400/1500940800

(Quick)sold for 65?

https://backpack.tf/profiles/76561198048851745#!/compare/1500768000/1500854400

Not sure if it qsed. Owner had it for a while. Probably best at 90 flat

Spellbound spartan: 105-110 keys

Sold for knife tam (~60*) + eldritch bicorne (~44) + 8 keys

https://backpack.tf/profiles/76561198050745352#!/compare/1502668800/1502755200

Tam is outdated and would get a huge range which happens to be around current

~112

Tam sales:

Cmoon glen (outdated 47, sellers at 42)

https://backpack.tf/profiles/76561198254219432#!/compare/1499558400/1499731200

Bulk

https://backpack.tf/profiles/76561198040280241#!/compare/1501891200/1501977600

Bulk

https://backpack.tf/profiles/76561198074924284#!/compare/1501286400/1501372800

Ghosts stove (41) + stare fez (41)

https://backpack.tf/profiles/76561198018823628#!/compare/1502064000/1502150400

~82

40-80 is probably too large a range, so its really hard to use that

STBWC snaggle (~43*) + spellbound counter (~45) + iso blue mew (FT) (~18)

https://backpack.tf/profiles/76561198127565155#!/compare/1500336000/1500422400

theres nothing on the snaggle but supports the other sale

~106

105-110 can work there, especially as a mini. You can make a full suggestion, but that will likely be left open for a while. The tam shouldnt be suggested yet

The luger has a SCM sale at ~225:

http://steamcommunity.com/market/listings/440/Vintage%20Lugermorph

There are plenty of sellers around this. This too shouldnt be suggested, because it concerns a dupe here.

At this, the sale will be 225+107+103+70+35 = 540

The cotton sale mentioned in the comment section, in all honesty, is probably just an indication that the cotton is still way too high. Other sales there

https://backpack.tf/profiles/76561197972404012#!/compare/1498694400/1498780800 duped dbd antlers

https://backpack.tf/profiles/76561198050933686#!/compare/1501718400/1501891200 frostbite boa + burning gauzed (~540 at current values and Im sure that gauzed is too high)

The last sale is what the trader involved in this cotton sale resold it for, indicating the buyer clearly did not value it as high as it appears at current.

I would go 540-690 here. The cotton with a realistic range would likely support the middle value here