This is gonna be a suggestion

https://backpack.tf/profiles/76561198163289648#!/compare/1708041600/1708128000 ~ bought for a vicious circle vampire (28.5), frosty flavours bomber knight (400), frosty flav vampire, fairy lights highway, strange jellyfish lid, haunted forever fly reel (90) and bone zone pullover + 100 keys (63 show but see screenshot)

https://backpack.tf/profiles/76561198057452720#!/compare/1708041600/1708128000

Screenie from Neko: https://steamuserimages-a.akamaihd.net/ugc/2488877813552286593/63BF02E4FA561E4D04EF96A36B2B582C6D99D7D7/

History bastard from Orange: https://i.imgur.com/cxYy7nL.png

Mini's:

BZ Pullover: https://backpack.tf/suggestion/6629e50040756e5d320bfd1e ~ 200

Jellyfish Lid: https://backpack.tf/suggestion/6629e678cf3e2b1d05084c0a ~ 700

Fairy Highway Star: https://backpack.tf/suggestion/6629e9121baf1fe7740839ba ~ 40

https://backpack.tf/stats/Unusual/Vampire%20Vanquisher/Tradable/Craftable/315 ~ no mini (Frosty flavours vampire)

100 keys pure + 200 (pullover) + 400 (bomber knight) + 700 (Jellyfish Lid) + 40 (Fairy Highway Star) + 28.5 (vicious vampire) + 90 (Haunted fly reel) + ? (frosty vampire)

= 1558.5

Guideline - for hats 1000+ keys, please round to the nearest 50 keys

For the frosty vampire: "if he sells it to the bot buyers for 22, it will be 1581, which rounds to 1600, if he sells it for 50, it will be 1614, which rounds to 1600, so either way if he sells it for his buyout or to bots price or somewhere in the middle, it will be 1600 regardless." https://i.imgur.com/1IJLhHc.png

Taking 1600.