List of most wanted mods for weapons

Hi, sorry to have to ask this but I need a little help. I remember about a month ago I was looking through the trade forums to see what my finds were worth when I found a lovely thread that listed the most wanted attributes were.

I'm talking about the attributes like the 15^50 etc and which skins were wanted more. I wish I had thought to add it to my list, but didn't at the time and now cannot find it again.

Any help would be appreciated. Also if anyone knows how they work out the prices at all that would be interesting. I know I've trashed some things thinking they were useless only to see they are worth 5platinum or so...

Thanks