I'll pretty much only trade these for items on my wishlist.
These are the items I want most at the moment. I'll basically trade anything in my entire NC list for them.
My regular NC wants. Higher priority than my casuals, but still not as critical as my priority items. I may trade HTPW items for them, but it depends on the items in question.
These items aren't currently important, so until I have my two priority wishies I won't be actively seeking them.