When judging equipment, whether a drop or in the Auction house, it's often best to know how far the item is from being "optimal." For example, a +intelligence +vitality ring may have +40 of each, but the cap for the modifier at the level of the ring may allow for up to +65 of each.
Is there a table or list of these caps? Level 60 stat modifiers would be good, but a list of modifiers by level would be excellent.
Best Answer
A couple of good off-site resources for affix ranges:
http://www.diablofans.com/topic/41045-spoiler-diablo-iii-item-affixes/
http://diablo.incgamers.com/forums/showthread.php?816871-List-of-all-Affixes-with-Stats
Incgamers also has a very nice chart to show the maximum affix value possible on equipment and the total maximum that you can get. Some comments indicate the data might be inaccurate, but it will serve well to get a general idea.
Note: When this answer was last updated, neither of them were accurate for IAS values (which were changed in 1.0.3). Also, the Diablofans version which I used to make the list below has some incorrect values such as for CritChance, so ymmv on the accuracy of other entries :(.
From a look at the Diablofans list, some of the maximum value caps for the various modifiers are listed below.