Classifieds Sellers: http://imgur.com/a/gt9to

8x @6

3x @6.33

1x @6.66

Classifieds Unsolds: http://imgur.com/a/5RoFW

@7

1x very young (< 1 day)

1x 2 days

1x 5 days

2x 6 days

1x 7 days

@7.33

1x 6 days

@7.66

1x 6 days

@7.88

1x 3 days

@8

6x very young (< 1 day)

1x 1 day

1x 2 days

3x 4 days

Outpost Sellers:

@6

http://www.tf2outpost.com/trade/28201356 - 1 day

@6.33

http://www.tf2outpost.com/trade/28202939 - 1 day

Outpost Unsolds:

@7

http://www.tf2outpost.com/trade/28195793 - 4 days

@7.33

http://www.tf2outpost.com/trade/28200274 - 2 days

@8

http://www.tf2outpost.com/trade/28202057 - 1 day

http://www.tf2outpost.com/trade/28192968 - 5 days

@8.33

http://www.tf2outpost.com/trade/28193403 - 4 days

6 flat should be fine.

All the unsolds prove happy's sale to be an outlier.