http://www.tf2outpost.com/trade/6954846 - Offers:

"5 pure " - rejected, wanted 7

"ghost demo raincather + 3 pure buds " (5 mixed, outdated price)

"stormy bubble pipe + planets dragonborn " (4.8 unusuals) But changed to...

"planets voodoo juju + planets swagman" (4.5 unusuals)

http://www.tf2outpost.com/trade/7956291 - Newer harder to price offers:

"Misty Skull Yellowbelt" - 7.4 on bp.tf but old, apparently OP did research and came up with a value of ~6

"Lantern Bicorne?" - 6.1 on bp.tf but also old, a quick look at it shows no sign of anything with high overpriced buyouts and no offers.

Conclusion: 4.8-5 easy to get it seems? For the high end, two recent offers that might reach 6? Ill stay a bit conservative while giving the OP some wiggle room

Input welcomed on this one.