Anything below 1.2 keys is pretty much a quicksell.

Fairly hard to sell at 1.6 keys (I couldn't find any sales at that price), but there are too many 1.4-1.5 key sellers to keep it in the range.

1.2 keys~ 1 key+1 ref

1.5 keys~ 1 key+2.66 ref

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BUYERS

Bought trades

http://www.tf2outpost.com/trade/11813138 1 key+craft hat

http://www.tf2outpost.com/trade/11795888 1 key+2 ref

Buying for ~1.1 keys

http://www.tf2outpost.com/trade/11539848 (1 key+0.55 ref) 1 week, none in BP

http://www.tf2outpost.com/trade/11707453 (6 ref) 4 days, only 1 in BP

Buying for 7 ref (1.3 keys)

http://www.tf2outpost.com/trade/4922646

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SELLERS

Sold trades

http://www.tf2outpost.com/trade/11829721 1 key+1 ref

http://www.tf2outpost.com/trade/11811958 1 key+1 ref

http://www.tf2outpost.com/trade/11818843 S. Deadringer (6-6.33 ref)

http://www.tf2outpost.com/trade/11842325 1 key+1.33 ref

http://www.tf2outpost.com/trade/11847359 1 key+2 ref

http://www.tf2outpost.com/trade/11844578 1 key+2 ref

http://www.tf2outpost.com/trade/11830666 1 key+2.33 ref

http://www.tf2outpost.com/trade/11821753 1 key+2.66 ref

Selling for ~1.2 keys

http://www.tf2outpost.com/trade/11439456 1 key+1 ref

http://www.tf2outpost.com/trade/11678624 1 key+1.33 ref

Selling for ~1.4 keys

http://www.tf2outpost.com/trade/11644598 1 week

http://www.tf2outpost.com/trade/11793734 2 days

http://www.tf2outpost.com/trade/11840551 8 hrs

http://www.tf2outpost.com/trade/11843231 5 hrs

http://www.tf2outpost.com/trade/11847359 1 hr

http://www.tf2outpost.com/trade/11847870 1 hr

Selling for ~1.5 keys

http://www.tf2outpost.com/trade/11650696 1 week (not bumped)

http://www.tf2outpost.com/trade/11654918 6 days (not bumped)

http://www.tf2outpost.com/trade/11724715 4 days

http://www.tf2outpost.com/trade/11796177 1 day

http://www.tf2outpost.com/trade/11816392 1 day

Selling for ~1.6 keys

http://www.tf2outpost.com/trade/11625091 1 week (barely bumped)

http://www.tf2outpost.com/trade/11681441 5 days (not bumped)

http://www.tf2outpost.com/trade/11750697 3 days (not bumped)

http://www.tf2outpost.com/trade/11839333 10 hrs

http://www.tf2outpost.com/trade/11843781 5 hrs

Michael Puddington's trades

Buying for 1.1 keys (6 ref) http://www.tf2outpost.com/trade/10859758 (1 month) no recent offers (many in BP though)

Selling for 1.6 keys http://www.tf2outpost.com/trade/9693922 (2 months) no recent offers, not sure how successful