http://www.wowhead.com
Wowhead is a World of Warcraft database. Put simply, it has a record of every item in the game (pretty much), along with user-generated comments and screenshots. Using this, it is possible to look for upgrades for oneself, without needing to post on here and wait for an answer. So how does one do this? Well, the main page of Wowhead looks like this:
From this page, you need the "Database" option, which I've pointed out with a massive Pink arrow. Mouse over this, then over "Items" then "Weapons" (if you want to look at Weapons) or "Armor" (if you want to look at Armour). If you're looking for Armour, you should then click on "Plate" followed by the type of Armour you're looking for - if you're looking for weapons, you don't need to. Once you reach this page, you'll be looking at all the items of one type. While this is useful, there are between several hundred and several thousand choices for each slot. To narrow this down, you need to create a filter. The option to do this is shown here (highlighted once again by the giant pink arrow of doom):
Once you click this button, you will see several drop down boxes. The ones you are interested in are "Level" (set between a few either side of your current level, or to 78+ if 80 (80 if looking for Epic upgrades)) and the bottom, unlabelled, box. When you click this, it opens a drop-down menu. Scroll down this, and select the top five options under "Defensive Stats". Then change the circles from "All filters" to "At least one". Finally, click "Apply Filter" and enjoy your list of gear!
