Screenshot of my trade: http://gyazo.com/757c7d59ec71862ab93b2837e89dba03

So let's get the easy numbers done first:

10 Pure Buds

White Bill's = ~9.5 Keys

Black Bill's = ~9.5 Keys

Strange Machina w/ Headshot Kills + Snipers Killed = ~21 Keys

So far that is 10 Buds + ~40 Keys.

Onto the tricky part:

Haunted Ghost Cold Killer - Estimated median is 11.2. First reported sales were made at the value of 10 Buds in Unusuals, then went on to sell at 15 Buds in Unusuals (as discussed in this thread; http://backpack.tf/vote/id/510ec392ba25363256000001 ). This hat has a fairly wide and unpredictable range in it's history, so 10-12.5 is my suggested value here.

Roboactive VRH - This is the "Monoculus Rift" you see in the trade. This is the toughest to price. My B/O was at 6 Buds but was never met, where sellers with Anti Freeze were selling for 4 Buds pure with relative success. Going on a lot of bp.tf's price listings, Roboactive is often the higher pick to Anti Freeze in value with the majority of hats, besides those where the name/description of the hat plays on the "theme" of heat/cold. My suggested value here is 4-5.

In conclusion, the low-end range adds up to ~25.7 and the top-end range adds up to ~29.2.

My final suggested price based on all this evidence:

Roboactive Brown Bomber = 25.7-29.2 Buds