Location of items?
I love the idea of shopping for upgrades for existing gear, but there are a few features I wish you had:
* Show the Zone / MoB that drops the upgrade
* Filter the upgrades by Solo / Group / Raid requirements
* Filter by Crafted / Available on Broker
* Filter by level (if you are looking up BP's for a level 50 toon, just show BP's that a 50 toon can wear.