With the Market Place forum for Diablo i think that u should have like a section where you can choose what you want for example.
The (XXX) represents the number of posts.

Unique Weapons (56)
Unique Armors (13)

once clicked on those it goes even further more in dept like

Unique armors boots (4)
Unique armors belts (7)

im not sure if ppl want this or this could be done....but that would b pretty easy to find what u actually want IMO. for the marketplace forum.